Catch all Exceptions if guest crashed and fix command for tty1 process c...

...hecking

1. When crash guest via session command, it may raise 2 type Exceptions,
so catch them all to pass this step.
2. If the guest started with X window, the old grep keyword can not find
the tty1 process, so just use 'tty1' for the checking.

Signed-off-by: Yanbing Du <ydu@redhat.com>