Fix the default port of Apache.

[qingling128]

The default port of Apache should be 80 instead of 8080.

Apache users today have to explicitly specifyserver_status_url: http://localhost:80/server-status?auto in their config today to customize the config.

b/207530308

[igorpeshansky]

LGTM

[qingling128]

Debian test is failing for tomcat, which is a known issue and being fixed by a separate PR.

--- FAIL: TestThirdPartyApps (0.00s)
    --- FAIL: TestThirdPartyApps/debian-10 (0.00s)
        --- PASS: TestThirdPartyApps/debian-10/couchdb (167.13s)
        --- PASS: TestThirdPartyApps/debian-10/postgresql (180.82s)
        --- PASS: TestThirdPartyApps/debian-10/memcached (203.17s)
        --- FAIL: TestThirdPartyApps/debian-10/apache (205.31s)
        --- PASS: TestThirdPartyApps/debian-10/redis (208.86s)
        --- PASS: TestThirdPartyApps/debian-10/solr (236.69s)
        --- PASS: TestThirdPartyApps/debian-10/mysql (242.68s)
        --- PASS: TestThirdPartyApps/debian-10/nginx (248.99s)
        --- PASS: TestThirdPartyApps/debian-10/jvm (249.45s)
        --- PASS: TestThirdPartyApps/debian-10/cassandra (263.35s)
        --- PASS: TestThirdPartyApps/debian-10/mongodb (307.84s)
        --- PASS: TestThirdPartyApps/debian-10/elasticsearch (315.00s)
        --- FAIL: TestThirdPartyApps/debian-10/tomcat (388.75s)