Don't run the gate-grenade-dsvm-barbican-ubuntu-xenial-nv gate

[Nam]

Currently, the gate setup for barbican grenade still is not successful. there is a bug during running grenade [1]. It need to update some configuration.

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[1] Here is log:
2017-04-05 12:27:52.568 | + functions-common:git_clone:532 : [[ True = \T\r\u\e ]]
2017-04-05 12:27:52.570 | + functions-common:git_clone:533 : echo 'The /opt/stack/old/barbican project was not found; if this is a gate job, add'
2017-04-05 12:27:52.570 | The /opt/stack/old/barbican project was not found; if this is a gate job, add
2017-04-05 12:27:52.571 | + functions-common:git_clone:534 : echo 'the project to the $PROJECTS variable in the job definition.'
2017-04-05 12:27:52.571 | the project to the $PROJECTS variable in the job definition.
2017-04-05 12:27:52.572 | + functions-common:git_clone:535 : die 535 'Cloning not allowed in this configuration'
2017-04-05 12:27:52.574 | + functions-common:die:186 : local exitcode=0
2017-04-05 12:27:52.575 | [Call Trace]
2017-04-05 12:27:52.575 | ./stack.sh:552:fetch_plugins
2017-04-05 12:27:52.575 | /opt/stack/old/devstack/functions-common:1797:git_clone_by_name
2017-04-05 12:27:52.575 | /opt/stack/old/devstack/functions-common:578:git_clone
2017-04-05 12:27:52.575 | /opt/stack/old/devstack/functions-common:535:die
2017-04-05 12:27:52.578 | [ERROR] /opt/stack/old/devstack/functions-common:535 Cloning not allowed in this configuration
2017-04-05 12:27:53.581 | Error on exit
2017-04-05 12:27:53.591 | ./stack.sh: line 501: generate-subunit: command not found
2017-04-05 12:27:53.595 | + ./grenade.sh:main:1 : exit_trap
2017-04-05 12:27:53.596 | + functions:exit_trap:103 : local r=127
2017-04-05 12:27:53.598 | 1 main ./grenade.sh
2017-04-05 12:27:53.598 | Exit code: 127
2017-04-05 12:27:53.623 | World dumping... see /opt/stack/logs/worlddump-2017-04-05-122753.txt for details
2017-04-05 12:27:53.650 | /bin/sh: 1: brctl: not found
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Full log: http://logs.openstack.org/79/452679/4/experimental/gate-grenade-dsvm-barbican-ubuntu-xenial-nv/ca669b8/logs/grenade.sh.txt.gz