Description of problem:
Should create service account during creating ipfailver pod if the specified service account is not exist. or give a error message like "your specified service account is not exist" at least. 

for now if the service account is not exist or did not be add to scc privileged. ipfailover pod can be deployed but cannot be created on node.

Version-Release number of selected component (if applicable):
# openshift version
openshift v3.2.0.14
kubernetes v1.2.0-36-g4a3f9c5
etcd 2.2.5


How reproducible:
always

Steps to Reproduce:
1. Create ipfaiover pod using one non-exist service account
  oadm ipfailover ipf2  --virtual-ips="10.66.127.100-101" --credentials=/etc/origin/master/openshift-router.kubeconfig --replicas=2 -w 1936 --service-account=non-exist --images='brew-pulp-docker01.web.prod.ext.phx2.redhat.com:8888/openshift3/ose-${component}:${version}' --create


Actual results:

step 1 will show "deploymentconfig "ipf2" created", but ipfailover pod cannot be created since no scc privileged for this service account

Expected results:
1. openshift can create service account at same time if not exist the user specified
2. if the service account is not add to scc privileged. should also give a prompt message

Additional info: