component/replication-manager: update revision

New revision include a fix for waitdatabases which cause repman test instability.

component/replication-manager/buildout.cfg

@@ -30,4 +30,4 @@ go.importpath = github.com/signal18/replication-manager
 repository =  https://github.com/signal18/replication-manager
 #branch = 2.1
 branch = develop
-revision = 838ffeb205ea4477f1c1bda607940fa07d8bcf51
\ No newline at end of file
+revision = 774fde2ce67942a31b99200fea6301189344ecd9
\ No newline at end of file