Add test for modules.linux_lvm.pvcreate on existing LVM PVs
Add test for modules.linux_lvm.pvcreate on existing LVM PVs

If all the devices submitted to pvcreate() are already initialized as
LVM physical volumes, pvcreate() should return True and no futher
actions should be made.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt