frontend: change VM status icons

Changes:
- up/down and suspend action buttons changed to correspond the status icons
- suspended icon changed to moon
- paused icon is ||
- added specific icon for rebooting state
- saving and restoring state have a wait icon
- wait for lunch has a grey starting icon
- up and down states are now up/down icons
- run once icon has an up arrow with a gear

Change-Id: I33daac391e547d5874343ca6fd6199dc505f05a4
Signed-off-by: Tomas Jelinek <tjelinek@redhat.com>