tests: Wait up to OVS_CTL_TIMEOUT seconds.

While running tests under valgrind, it could take more than 10 seconds
for process to disappear after successful 'ovs-appctl exit' command.

Same applies to some other events that tests are waiting for with
OVS_WAIT macro.  This makes tests to fail frequently under valgrind.

Using OVS_CTL_TIMEOUT variable instead of constant 10 seconds seems
reasonable to avoid this issue because it controls timeouts of all
control utilities and needs to be adjusted while running under valgrind
anyway.

Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Acked-by: Aaron Conole <aconole@redhat.com>
Signed-off-by: William Tu <u9012063@gmail.com>

tests/ovs-macros.at

@@ -229,9 +229,9 @@ ovs_wait () {
     sleep 0.1
     if ovs_wait_cond; then echo "$1: wait succeeded quickly" >&AS_MESSAGE_LOG_FD; return 0; fi
 
-    # Then wait up to 10 seconds.
+    # Then wait up to OVS_CTL_TIMEOUT seconds.
     local d
-    for d in 1 2 3 4 5 6 7 8 9 10; do
+    for d in `seq 1 "$OVS_CTL_TIMEOUT"`; do
         sleep 1
         if ovs_wait_cond; then echo "$1: wait succeeded after $d seconds" >&AS_MESSAGE_LOG_FD; return 0; fi
     done