Wildfly logging receiver

[dehaansa]

Named wildfly_server as there are wildfly audit logs that we are not targeting for this effort according to the agreed upon spec, but I wanted to leave room for their addition in the future without feeling like a rename would be appropriate.

[dehaansa]

Current debian failures include tomcat & mysql, wildfly is passing.

    --- FAIL: TestThirdPartyApps/debian-10 (0.00s)
        --- PASS: TestThirdPartyApps/debian-10/elasticsearch (292.62s)
        --- PASS: TestThirdPartyApps/debian-10/redis (349.54s)
        --- PASS: TestThirdPartyApps/debian-10/couchdb (369.34s)
        --- PASS: TestThirdPartyApps/debian-10/postgresql (383.98s)
        --- PASS: TestThirdPartyApps/debian-10/wildfly (425.24s)
        --- PASS: TestThirdPartyApps/debian-10/memcached (435.71s)
        --- PASS: TestThirdPartyApps/debian-10/apache (454.81s)
        --- PASS: TestThirdPartyApps/debian-10/mongodb (456.58s)
        --- PASS: TestThirdPartyApps/debian-10/jvm (489.18s)
        --- PASS: TestThirdPartyApps/debian-10/cassandra (492.70s)
        --- PASS: TestThirdPartyApps/debian-10/nginx (497.46s)
        --- PASS: TestThirdPartyApps/debian-10/solr (501.21s)
        --- FAIL: TestThirdPartyApps/debian-10/mysql (989.27s)
        --- FAIL: TestThirdPartyApps/debian-10/tomcat (1004.48s)```

[dehaansa]

As of commit bab6dcb all integration tests passing other than known postgresql issues.

Outstanding concerns:
Investigating domain controller logs to see if they are formatted the same and can be dropped in without issue. #382 (comment)
Waiting @qingling128 's perspective on naming comment #382 (comment)

[qingling128]

LGTM module @ridwanmsharif 's feedback is addressed. I also left some minor comments.

@ridwanmsharif Feel free to merge if the comments are addressed and tests passed. (aka I will check back periodically, too. But another round of reviews by me is not required, as the feedback is minor.)

[ridwanmsharif]

LGTM. Will merge after we decide on the ./domain/log/*.log files

[dehaansa]

Re: #382 (comment) - hoping to have this well understood early Monday, so this'll have to wait until then.

Edit: got this figured out faster than anticipated, it's supported. Added some examples to the comments, and updated default paths & named _system as noted by Ling. Once kokoro's running well again will get this validated so we can push forward.