test/common: Make common pmap call more generic

This is to support older versions of pmap (specifically procps v 3.2.8
which ships with centOS 6) which don't support the -p and -X options.

Change-Id: Ic8d4b94985c165e8bf224204af48b5d856aa2403
Signed-off-by: Seth Howell <seth.howell@intel.com>
Reviewed-on: https://review.gerrithub.io/411755
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>

test/common/autotest_common.sh

@@ -365,7 +365,7 @@ function start_stub() {
 		sleep 1s
 	done
 	# dump process memory map contents to help debug random ASLR failures
-	pmap -pX $stubpid
+	pmap -pX $stubpid || pmap -x $stubpid || true
 	echo done.
 }