test: properly handle the killprocess case

To check whether the process already killed and if the
process is not there, return error.

This is to fix the below issue:
https://github.com/spdk/spdk/issues/1066

Change-Id: I5f36213237a4b0eed8edbc69e666037cf17488b2
Signed-off-by: GangCao <gang.cao@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/476127
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Karol Latecki <karol.latecki@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Community-CI: SPDK CI Jenkins <sys_sgci@intel.com>

test/common/autotest_common.sh

@@ -483,6 +483,10 @@ function killprocess() {
 		# wait for the process regardless if its the dummy sudo one
 		# or the actual app - it should terminate anyway
 		wait $1
+	else
+		# the process is not there anymore
+		echo "Process with pid $1 is not found"
+		exit 1
 	fi
 }
 

test/nvmf/target/filesystem.sh

@@ -75,6 +75,7 @@ function nvmf_filesystem_part {
 	trap - SIGINT SIGTERM EXIT
 
 	killprocess $nvmfpid
+	nvmfpid=
 }
 
 run_test "suite" "nvmf_filesystem_no_incapsule" nvmf_filesystem_part 0

test/nvmf/target/fuzz.sh

@@ -38,5 +38,6 @@ trap - SIGINT SIGTERM EXIT
 
 nvmfcleanup
 killprocess $nvmfpid
+nvmfpid=
 
 nvmftestfini

test/nvmf/target/shutdown.sh

@@ -87,6 +87,7 @@ function nvmf_shutdown_tc3 {
 
 	# Kill the target half way through
 	killprocess $nvmfpid
+	nvmfpid=
 
 	# Verify bdevperf exits successfully
 	sleep 1