CE-3075: Set AWX timeout for IOC jobs
The timeout is set to not have stuck jobs block subsequent ones.
From having looked at 500 of the latest jobs, the avg for an "NFS" deployment is about 2.5 min, the avg for a conda deployment is about 5 min, and the longest job I could find (which was for a conda deployment) amounted to just under 10 minutes. Based on this, adding a 50% buffer, the timeout value is set to 900 (15 x 30) seconds.