testsuite shmid can be hex too

Previously the match for shmid was \d+ but the variable is printed
as a hex number, updated the regex to suit.

Added some changes for pmap test so if the test_shm process fails
we just skip past it.

Signed-off-by: Craig Small <csmall@dropbear.xyz>

testsuite/config/unix.exp

@@ -195,8 +195,8 @@ proc make_testshm_proc { } {
     set testshmproc_spawnid $spawn_id
     expect {
 	-i $testshmproc_spawnid
-	-re "^SHMID: (\\d+)" { set shmid $expect_out(1,string) }
-	default { fail "spawning testshm" }
+	-re "^SHMID: (\[0-9a-f\]+)" { set shmid $expect_out(1,string) }
+	default { set shmid "" }
     }
 
 }