Create openstack.common.timeutils.
Create openstack.common.timeutils.

Split time related utility functions out of openstack.common.utils into
a new module, timeutils.

Change-Id: Ic09952cd48e0b4548e410926cc456cbd515a4e56

JioCloud/pbr,WiFast/pbr,WiFast/pbr,citrix-openstack-build/pbr,openstack-dev/pbr,varunarya10/pbr,klmitch/pbr,emonty/oslo-packaging,JioCloud/pbr,openstack-dev/pbr,klmitch/pbr,citrix-openstack-build/pbr,emonty/oslo-packaging,citrix-openstack-build/pbr,redhat-openstack/pbr,redhat-openstack/pbr,openstack-dev/pbr,varunarya10/pbr