Remove obsolete QNX exclusions.

QNX has since changed to Aura and no longer has its own implementations
of those files.

Change-Id: I193dfa82093530742e6c6599750972bce0e69e39
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>
Reviewed-by: Arvid Nilsson <anilsson@blackberry.com>
Provide option to bypass adding the gerrit/commit hook remote.

For developers behind a firewall blocking ssh, the init-repository
script will hang. Add a "--no-gerrit" argument that will skip adding
the gerrit remote and commit hook.

Change-Id: I130a5897f33925876922bbfea4976f24c484ef31
Reviewed-by: Andras Becsi <andras.becsi@digia.com>