check for path of mongodb would be nice to includer

[altanner]

currently it goes "is mongodb running?" ok. when we want "if mongodb is running where?" "if running db is not this folder, give warning". doing crazy stuff like

existing_mongodb_dbpath = subprocess.check_output(["ps", "ax", "|",
                                "grep", "-v", "awk", "|",
                                "awk", "'{for(i=1;", "i<=NF;", "i++)",
                                "if($i~/mongod/)", "print", "$(i+2)}'"])

doesn't work as | are seen as literals by shell.