Use `arg` and `env` from cliutils: v1_1/shell

To remove aliases for `arg` and `env` functions in novaclient.utils,
we should use `arg` and `env` directly from cliutils in novaclients modules.
This is the first stage: change usage in novaclient.v1_1.shell

Change-Id: I237f0473844de49db8a4b141a9a71603c9ac76a7
Remove aliases for `args` and `env` in utils

To remove aliases for `arg` and `env` functions in novaclient.utils,
we should use `arg` and `env` directly from cliutils in novaclients modules.

This patch removes aliases in `novaclient.utils` and starts using
`args` and `env` from novaclient.openstack.common.cliutils directly.

Change-Id: I4585adae62bc66ad6bc9d19be10d4679bb3dc5a1
Updated from global requirements

Change-Id: I31700b01e5b56221059b64ca66ec2e7d374d5c84