Revert "lock.py: is_vpm should test is_vm"
Revert "lock.py: is_vpm should test is_vm"

This reverts commit be9aa8a6cfe6c3d182ba640ceadf1b3a2ff93d53.

is_vm() is passing 'user@host' instead of just 'host'

Signed-off-by: Zack Cerza <d7cdf09fc0f0426e98c9978ee42da5d61fa54986@redhat.com>

robbat2/teuthology,ivotron/teuthology,dreamhost/teuthology,robbat2/teuthology,SUSE/teuthology,dreamhost/teuthology,ceph/teuthology,michaelsevilla/teuthology,ktdreyer/teuthology,dmick/teuthology,caibo2014/teuthology,ktdreyer/teuthology,ivotron/teuthology,dmick/teuthology,dmick/teuthology,SUSE/teuthology,caibo2014/teuthology,ceph/teuthology,SUSE/teuthology,michaelsevilla/teuthology