util-lib: split string parsing related calls from util.[ch] into parse-util.[ch]

src/test/test-cap-list.c

@@ -19,11 +19,13 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include "util.h"
-#include "fileio.h"
+#include <sys/prctl.h>
+
 #include "cap-list.h"
 #include "capability.h"
-#include <sys/prctl.h>
+#include "fileio.h"
+#include "parse-util.h"
+#include "util.h"
 
 /* verify the capability parser */
 static void test_cap_list(void) {