Merge pull request #4230 from esl/fix_duplicate_migrations #1073

Job	Run time
dialyzer on OTP 25.2	4m 38s
edoc on OTP 25.2	2m 17s
dynamic domains pgsql_mnesia on OTP 26.1.2	19m 11s
internal_mnesia on OTP 26.1.2	20m 0s
dynamic domains mysql_redis on OTP 26.1.2	17m 38s
pgsql_mnesia on OTP 26.1.2	22m 11s
dynamic domains odbc_mssql_mnesia on OTP 26.1.2	19m 57s
mysql_redis on OTP 26.1.2	21m 44s
centos_7 package	5m 58s
dynamic domains pgsql_mnesia on OTP 25.3.2.6	18m 27s
odbc_mssql_mnesia on OTP 26.1.2	23m 52s
small_tests on OTP 25.3.2.6	7m 45s
ubuntu_xenial package	5m 30s
ldap_mnesia on OTP 26.1.2	18m 1s
small_tests on OTP 26.1.2	8m 23s
elasticsearch_and_cassandra_mnesia on OTP 26.1.2	6m 47s
ldap_mnesia on OTP 25.3.2.6	17m 34s
xref on OTP 25.2	1m 56s
pgsql_mnesia on OTP 25.3.2.6	22m 10s
coveralls_webhook	0s
	4h 23m 59s

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