stubbed ghe-service-wait-mysql and fixed typo in other test file

test/bin/ghe-es-snapshot

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # Usage: ghe-es-snapshot
-# Emulates the remote GitHub ghe-service-ensure-mysql command. Tests use this
+# Emulates the remote GitHub ghe-service-es-mysql command. Tests use this
 # to assert that the command was executed.
 set -e
 echo "ghe-es-snapshot OK"

test/bin/ghe-service-wait-mysql

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+# Usage: ghe-service-wait-mysql
+# Emulates the remote GitHub ghe-service-wait-mysql command. Tests use this
+# to assert that the command was executed.
+set -e
+echo "ghe-service-wait-mysql OK"