Add bit_length_power_of_2 to filters folder
Add bit_length_power_of_2 to filters folder

We are moving this filter into this repository because it's only
usage is here. It will then be removed from openstack-ansible-plugins.

Patch set 2: Fix whitespace

Change-Id: I543328db49dc6b7bbb05878503dbb3d337a18558
Related-Bug: #1826242

openstack/openstack-ansible-openstack_hosts,openstack/openstack-ansible-openstack_hosts