.gitignore: ignore tests/qemu-iotests/socket_scm_helper

Signed-off-by: NFam Zheng <famz@redhat.com>
Reviewed-by: Wenchao Xia<xiawenc@linux.vnet.ibm.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

tests/qemu-iotests/.gitignore

@@ -2,6 +2,7 @@ check.log
 check.time
 *.out.bad
 *.notrun
+socket_scm_helper
 
 # ignore everything in the scratch directory
 scratch/