Export opportunistic locking to CLI
Export opportunistic locking to CLI

Instance creation supports opportunistic locking. So,
also export it on the command line. There is no reason
to have this feature RAPI only.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>
Reviewed-by: Hrvoje Ribicic <riba@google.com>

Cherry-picked from e845c100bbe26784a83.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>

grnet/snf-ganeti,apyrgio/ganeti,ganeti/ganeti,mbakke/ganeti,mbakke/ganeti,onponomarev/ganeti,leshchevds/ganeti,mbakke/ganeti,bitemyapp/ganeti,dimara/ganeti,leshchevds/ganeti,ganeti/ganeti,grnet/snf-ganeti,ganeti/ganeti,yiannist/ganeti,ganeti-github-testing/ganeti-test-1,andir/ganeti,apyrgio/ganeti,andir/ganeti,yiannist/ganeti,dimara/ganeti,andir/ganeti,onponomarev/ganeti,bitemyapp/ganeti,leshchevds/ganeti,yiannist/ganeti,ganeti-github-testing/ganeti-test-1