[RFE] Let validate_env support --cloud with --skip-network

[sadsfae]

Currently /opt/quads/quads/tools/validate_env.py does not support the optional argument --cloud cloudXX with --skip-network

This RFE is to include this functionality.

# flock -n /tmp/validateenv.lock -c "/opt/quads/quads/tools/validate_env.py --cloud cloud39 --skip-network --debug"
usage: validate_env.py [-h] [--skip-network] [--debug]
validate_env.py: error: unrecognized arguments: --cloud cloud39

# flock -n /tmp/validateenv.lock -c "/opt/quads/quads/tools/validate_env.py --skip-network --debug"
Using selector: EpollSelector
Validating cloud39
:Initializing Foreman object:
GET: /status
GET: /hosts?search=build=true