Merge pull request #4294 from esl/mu-mam-muc-message-timestamp-bug #1120

Job	Run time
edoc on OTP 25.2	2m 11s
dialyzer on OTP 25.2	4m 46s
dynamic domains pgsql_mnesia on OTP 26.1.2	18m 43s
internal_mnesia on OTP 26.1.2	18m 59s
pgsql_mnesia on OTP 26.1.2	21m 22s
dynamic domains mysql_redis on OTP 26.1.2	17m 34s
mysql_redis on OTP 26.1.2	21m 10s
centos_7 package	6m 22s
dynamic domains odbc_mssql_mnesia on OTP 26.1.2	21m 30s
small_tests on OTP 25.3.2.9	8m 8s
odbc_mssql_mnesia on OTP 26.1.2	22m 25s
ubuntu_xenial package	5m 22s
dynamic domains pgsql_mnesia on OTP 25.3.2.6	17m 46s
small_tests on OTP 26.2.2	8m 15s
ldap_mnesia on OTP 26.1.2	17m 2s
elasticsearch_and_cassandra_mnesia on OTP 26.1.2	6m 56s
ldap_mnesia on OTP 25.3.2.6	16m 37s
xref on OTP 25.2	2m 0s
pgsql_mnesia on OTP 25.3.2.6	14s
coveralls_webhook	0s
	3h 57m 22s

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