s2aio uses a loop back device over a local file
as Swift device. This device may get corrupted
when rebooting the host while swift is running.
Adding the start and stop helps mitigate the problem
Also, with the recent move to devstack as the
installation script for Swift and Keystone
starting the swift and keystone services
have changed. Again, the s2aio start helps
here.
Change-Id: I3e3884a1a04888be577fe4f92d471a65f6f5ce5b
b3f3e0c44c