Update CNTT regexes and counts
It increases neutron-tempest-plugin-api test count to 502.
It skips test_multiattach_rw_volume_update_failure which depends on volume multi-attach.
http://artifacts.opnfv.org/functest/BVDINIZ8P8UC/functest-opnfv-functest-smoke-cntt-latest-neutron-tempest-plugin-api-cntt-run-6/neutron-tempest-plugin-api-cntt/tempest-report.html
http://artifacts.opnfv.org/functest/BVDINIZ8P8UC/functest-opnfv-functest-smoke-cntt-latest-tempest_full_cntt-run-5/tempest_full_cntt/tempest-report.html
Change-Id: Id4d4918ee24ef15f9610e706d6e90dfa3ae2cc43
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>