While installing Red Hat Satellite v 6, katello-installer command fails with error "/usr/sbin/foreman-rake db:migrate returned 1 instead of one of [0]"

Issue

• While installing Red Hat Satellite v 6, katello-installer command fails with error :

[ERROR 2016-03-09 12:08:46 main]  /Stage[main]/Apache/User[apache]/gid: change from 100513 to apache failed: Could not set gid on user[apache]: Execution of '/sbin/usermod -g 1000 apache' returned 6: usermod: user 'apache' does not exist in /etc/passwd
[ WARN 2016-03-09 12:55:43 main]  /Stage[main]/Foreman::Database/Foreman::Rake[db:migrate]/Exec[foreman-rake-db:migrate]/returns: Apipie cache enabled but not present yet. Run apipie:cache rake task to speed up API calls.
[ERROR 2016-03-09 12:55:43 main]  /Stage[main]/Foreman::Database/Foreman::Rake[db:migrate]/Exec[foreman-rake-db:migrate]: Failed to call refresh: /usr/sbin/foreman-rake db:migrate returned 1 instead of one of [0]
[ERROR 2016-03-09 12:55:43 main]  /Stage[main]/Foreman::Database/Foreman::Rake[db:migrate]/Exec[foreman-rake-db:migrate]: /usr/sbin/foreman-rake db:migrate returned 1 instead of one of [0]