Remove RemoteStack testing from tempest_heat_cntt

Remove RemoteStack testing from tempest_heat_cntt

Trusts redelegation is supported by Train [1][2] which forces to skip
RemoteStack as CNTT Baldy is designed for Pike (the support is
incomplete in case of trust [3]).

[1] https://docs.openstack.org/releasenotes/heat/train.html#relnotes-13-0-0-stable-train
[2] https://github.com/openstack/heat/commit/e377658586c737150dad1bfd80b7b2267d46be51
[3] https://bugs.launchpad.net/heat/+bug/1701498

Change-Id: Ib4f66170b9b1f50b8224705edb4820e5a4cb0167
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>