Do not use environment variables to pass OpenStack user/password/etc.

As the environment variable will stay during the whole chef run, it
could impact other commands. It's safer to use command line arguments
instead.
Use internalURL endpoint for quantum commands during the chef run

This is safer than using the publicURL.
Only use --endpoint-type and --insecure on SUSE and/or PFS

These options in the quantum command line tool are not in the Ubuntu
package.
Pass full quantum command to get_net_id_by_name helper

This allows passing all the required arguments.
Merge pull request #88 from vuntz/use-internalUrl

Use internalURL endpoint for commands during the chef run