Fix test for script being executable

This was failing for me because the script was mode `755` rather
than the expected `775`. Instead of testing a specific mode, just
test that the executable bits are set for everyone.

Author: stevenjm

test/testinfra/test_command.py

@@ -10,4 +10,4 @@ def test_healthcheck_script_is_executable(host):
     scriptFile = host.check_output("which php-fpm-healthcheck")
 
     assert host.file(scriptFile).exists is True
-    assert host.file(scriptFile).mode == 0o775
+    assert host.file(scriptFile).mode & 0o111 == 0o111