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/pmap.test/pmap.exp

@@ -68,6 +68,10 @@ expect_pass $test "$pmap_initname\$"
 
 set test "pmap finding shm"
 make_testshm_proc
-spawn $pmap $testshmproc_pid
-expect_pass $test "\[ shmid=0x$shmid \]"
+if { $shmid == "" } {
+    unsupported "$test - could not start test_shm"
+} else {
+    spawn $pmap $testshmproc_pid
+    expect_pass $test "\[ shmid=0x$shmid \]"
+}
 kill_testshm_proc