test: Make testing work on systems without or old systemd

* Introduce a macro to conditionally execute tests. This avoids
  skipping the entire test if some parts require systemd
* Skip the journal tests when no /etc/machine-id is present
* Change test-catalog to load the catalog from the source directory
  of systemd.
* /proc/PID/comm got introduced in v2.6.33 but travis is still
  using v2.6.32.
* Enable make check and make distcheck on the travis build
* Use -D"CATALOG_DIR=STR($(abs_top_srcdir)/catalog)" as a STRINGIY
  would result in the path '/home/ich/source/linux' to be expanded
  to '/home/ich/source/1' as linux is defined to 1.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/test/test-cgroup-util.c b/src/test/test-cgroup-util.c
index 295bb02e3b..16bf968340 100644
--- a/src/test/test-cgroup-util.c
+++ b/src/test/test-cgroup-util.c
@@ -23,6 +23,7 @@
 
 #include "util.h"
 #include "cgroup-util.h"
+#include "test-helper.h"
 
 static void check_p_d_u(const char *path, int code, const char *result) {
         _cleanup_free_ char *unit = NULL;
@@ -239,9 +240,9 @@ int main(void) {
         test_path_get_session();
         test_path_get_owner_uid();
         test_path_get_machine_name();
-        test_get_paths();
+        TEST_REQ_RUNNING_SYSTEMD(test_get_paths());
         test_proc();
-        test_escape();
+        TEST_REQ_RUNNING_SYSTEMD(test_escape());
         test_controller_is_valid();
         test_slice_to_path();