Change verbosity of installer script

[mtulio]

Proposed feature

Stdout script does not need to be verbose as it is. One ideia is to ignore stdout and log only stderr:

TASK [omsagent.chaordic : run script (can take a couple of minutes)] ***********************************************
Friday 14 August 2020  14:58:43 -0300 (0:00:00.045)       0:00:21.417 ********* 
fatal: [X.Y.Z.W]: FAILED! => {"ansible_facts": {"discovered_interpreter_python": "/usr/bin/python3"}, "changed": true, "cmd": ["/tmp/onboard_agent.sh"], "delta": "0:00:01.838361", "end": "2020-08-14 17:58:45.196673", "msg": "non-zero return code", "rc": 61, "start": "2020-08-14 17:58:43.358312", "stderr": "--2020-08-14 17:58:43--  https://github.com/microsoft/OMS-Agent-for-Linux/releases/download/OMSAgent_v1.13.9-0/omsagent-1.13.9-0.universal.x64.sh\nResolving github.com (github.com)... 140.82.112.3\nConnecting to github.com (github.com)|140.82.112.3|:443... connected.\nHTTP request sent, awaiting response... 302 Found\nLocation: https://github-production-release-asset-2e65be.s3.amazonaws.com/43709699/675ab800-dca3-11ea-9c7c-e1521faa2992?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200814%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200814T175843Z&X-Amz-Expires=300&X-Amz-Signature=45a99404c9a3fd462020940e4f5615404e62e77511a3d644d55082344df4ddb3&X-Amz-SignedHeaders=host&actor_id=0&repo_id=43709699&response-content-disposition=attachment%3B%20filename%3Domsagent-1.13.9-0.universal.x64.sh&response-content-type=application%2Foctet-stream [following]\n--2020-08-14 17:58:43--  https://github-production-release-asset-2e65be.s3.amazonaws.com/43709699/675ab800-dca3-11ea-9c7c-e1521faa2992?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200814%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200814T175843Z&X-Amz-Expires=300&X-Amz-Signature=45a99404c9a3fd462020940e4f5615404e62e77511a3d644d55082344df4ddb3&X-Amz-SignedHeaders=host&actor_id=0&repo_id=43709699&response-content-disposition=attachment%3B%20filename%3Domsagent-1.13.9-0.universal.x64.sh&response-content-type=application%2Foctet-stream\nResolving github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)... 52.217.14.172\nConnecting to github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)|52.217.14.172|:443... connected.\nHTTP request sent, awaiting response... 200 OK\nLength: 140652376 (134M) [application/octet-stream]\nSaving to: ‘omsagent-1.13.9-0.universal.x64.sh’\n\n     0K .......... .......... .......... .......... ..........  0% 35.1M 4s\n    50K .......... .......... .......... .......... ..........  0% 34.6M 4s\n   100K .......... .......... .......... .......... ..........  0% 48.3M 3s\n   150K .......... .......... .......... .......... ..........  0% 38.6M 3s\n   200K .......... .......... .......... .......... ..........  0% 51.8M 3s\n   250K .......... .......... .......... .......... ..........  0% 60.5M 3s\n   300K .......... .......... .......... .......... ..........  0% 45.2M 3s\n   350K .......... .......... .......... .......... ..........  0% 58.7M 3s\n   400K .......... .......... .......... .......... ..........  0% 64.4M 3s\n   450K .......... .......... .......... .......... ..........  0% 2.24M 9s\n   500K .......... .......... .......... .......... ..........  0%  800K 23s\n   550K .......... .......... .......... .......... ..........  0% 20.0M 22s\n   600K .......... .......... .......... .......... ..........  0%  651K 36s\n   650K .......... .......... .......... .......... ..........  0% 54.5M 34s\n   700K .......... .......... .......... .......... ..........  0% 72.5M 32s\n   750K .......... .......... .......... .......... ..........  0% 89.0M 30s\n   800K .......... .......... .......... .......... ..........  0% 73.1M 28s\n   850K .......... .......... .......... .......... ..........  0% 70.2M 27s\n   900K .......... .......... .......... .......... ..........  0% 76.4M 25s\n   950K .......... .......... .......... .......... ..........  0%  108M 24s\n  1000K .......... .......... .......... .......... ..........  0% 85.5M 23s\n  1050K .......... .......... .......... .......... ..........  0% 67.2M 22s\n  1100K .......... .......... .......... .......... ..........  0% 82.3M 21s\n  1150K .......... .......... .......... .......... ..........  0%  103M 20s\n  1200K .......... .......... .......... .......... ..........  0%  115M 20s\n  1250K .......... .......... .......... .......... ..........  0%  107M 19s\n  1300K .......... .......... .......... .......... ..........  0%  137M 18s\n  1350K .......... .......... .......... .......... ..........  1%  108M 18s\n  1400K .......... .......... .......... .......... ..........  1% 90.8M 17s\n  1450K .......... .......... .......... .......... ..........  1% 70.2M 17s\n  1500K .......... .......... .......

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Rationale

Avoid too much information on the terminal.