https://fedorahosted.org/389/ticket/502
https://fedorahosted.org/389/attachment/ticket/502/0001-Ticket-502-setup-...
Bug description: If multiple DSCreate or removeDSInstance run
simultaneously, semanage port fails because only one semanage
transaction is allowed to start.
Fix description: This patch puts "semanage port" in the while
loop and it retries until it succeeds or reaches the max retry
count (in total 5 minutes).