Add missing groupe_name for PowerPC and AArch64 added tests
That concerns:
test_suite => { name => "install_vnc_server" },
test_suite => { name => "install_vnc_client" },
test_suite => { name => "install_vncconnect_server" },
test_suite => { name => "install_vncconnect_client" },
Signed-off-by: Michel Normand <normand@linux.vnet.ibm.com>