Fix cluster-deployer script execution in venv
The hard-coded path to the python executable in deploy.py and restart.py
broke when executing them like scripts in virtual environments.
```
$ ./deploy.py
zsh: ./deploy.py: bad interpreter: /usr/local/bin/python: no such
file or directory
```
Moves to standard `/usr/bin/env python` method.
Removes extra comment character from just before restart.py shebang.
Marks restart.py as executable, since it's designed to be run like a
script.
Change-Id: I945e5704327fb8a2c6387a919054560bd23055d1
Signed-off-by: Daniel Farrell <dfarrell@redhat.com>