Remove write_requirements
Remove write_requirements

Everyone hated this, so we decided to get rid of it at the last summit.
Actually, come to think of it, I think we decied to get rid of it in San Fran.

Change-Id: I7d93af1eb98a37ff018730669731a7ee22516279

JioCloud/oslo-incubator,JioCloud/oslo-incubator,JioCloud/oslo-incubator