Reserve Keystone ports from the ephemeral range

Reserve Keystone ports from the ephemeral range as early as reasonably
possible in the fixup_stuff.sh process to reduce the likelihood that the
port will be in use. This does not completely resolve the issue
where Keystone's IANA assigned port falls into Linux's ephemeral
range, but this should reduce the occurrences. The default ports
are 35357 and 35358.

Change-Id: I8cfb53d8f90c1ff1fb1083c59fefabca3d14323b
Partial-Bug: #1253482
Merge "Reserve Keystone ports from the ephemeral range"
Merge branch 'master' of github.com:openstack-dev/devstack