Magnum demo scripts doesn't work cause compose/openstack.env
doesn't exist anymore.
* NETWORK_MANAGER check has been removed
* script has been updated to use Openstack client instead of
deprecated clients (neutron-client, glance-client).
* Magnum client calls have been adapted too.
* some enhancements (logs, variable) have been performed too.

Change-Id: I294b1876c9c7090785c0ebdd09b43843f88fb00b
Closes-Bug: #1670618

The file path was not properly passed to the '-x' test which caused it
to always return true.

This commit simplifies the test for existing command by relying only on
the exit code of `type` rather than checking that the file path is
executable.

Change-Id: Iaf47d92ff9fd1ef34d8d7492c08ec24d2b8a9536
Closes-Bug: #1635341

Keep consistent with other "if" condition
TrivialFix

Change-Id: I18fea71bd50729642543afd4d3bab0b7dfaecd3d

Correct relative path of kolla root directory after vagrant environment was
moved from dev/vagrant to contrib/dev/vagrant.

Closes-Bug: #1635329

Change-Id: Ib13a6123f34d69884e27029f5144ff1ad165e73e

TrivialFix

Change-Id: Ifb8f19afa1514488bd288670d08b96f84982a4e1