Evolve templates to include Colorado release

Evolve templates to include Colorado release

Evolved templates for system and ux requirements
to cover Colorado (in addition to Brahmaputra).

Requirements that are only for Brahmaputra
are flagged as "Brahmaputra:".

Requirements that are only for Colorado
are flagged as "Colorado:". Placeholders added only,
to be used as guiding examples (see e.g. for
Openstack version or OpenDaylight version).

Requirements that apply from Brahmaputra onwards are
tagged as "Brahmpautra and later:".

System.rst files which describe the components for
a release are move to release specific directories.

Change-Id: I614921a9bf9c8166c9a19000ee822bdc3b9e2994
Signed-off-by: Frank Brockners <fbrockne@cisco.com>