Merge pull request #4314 from esl/drop_centos #1126

Job	Run time
dialyzer on OTP 25.2	5m 1s
edoc on OTP 25.2	2m 11s
dynamic domains pgsql_mnesia on OTP 26.1.2	19m 16s
internal_mnesia on OTP 26.1.2	19m 45s
dynamic domains mysql_redis on OTP 26.1.2	19m 1s
ubuntu_xenial package	4m 44s
pgsql_mnesia on OTP 26.1.2	22m 3s
dynamic domains odbc_mssql_mnesia on OTP 26.1.2	20m 44s
mysql_redis on OTP 26.1.2	21m 45s
small_tests on OTP 25.3.2.9	7m 23s
dynamic domains pgsql_mnesia on OTP 25.3.2.6	18m 6s
odbc_mssql_mnesia on OTP 26.1.2	23m 26s
small_tests on OTP 26.2.2	8m 9s
xref on OTP 25.2	2m 42s
ldap_mnesia on OTP 26.1.2	18m 12s
elasticsearch_and_cassandra_mnesia on OTP 26.1.2	9m 26s
ldap_mnesia on OTP 25.3.2.6	17m 28s
pgsql_mnesia on OTP 25.3.2.6	21m 10s
coveralls_webhook	0s
	4h 20m 32s

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