QA: Do not pass "--bridge" to "gnt-cluster init"
QA: Do not pass "--bridge" to "gnt-cluster init"

Commit ec0652a (June 2009) removed the option.

This is a cherry-pick of master commit
784537390cd5b1c4f5f8fb9401a62eb23acce39b

Signed-off-by: Michael Hanselmann <68b67885ff74281219b4a4be33cc20fd45078d7c@google.com>
Reviewed-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>

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