fix run_remote with strong quoting

Summary:
add \' pair to avoid bash expanding before run remotely
Closes https://github.com/facebook/rocksdb/pull/2079

Differential Revision: D4821342

Pulled By: lightmark

fbshipit-source-id: 418ba41

tools/regression_test.sh

@@ -361,7 +361,7 @@ function run_remote {
 
 function test_remote {
   if ! [ -z "$REMOTE_USER_AT_HOST" ]; then
-      cmd="$SSH $REMOTE_USER_AT_HOST $1"
+      cmd="$SSH $REMOTE_USER_AT_HOST '$1'"
   else
       cmd="$1"
   fi