autotest: Make UT coverage setup independent from autotest.sh

Signed-off-by: Michal Berger <michal.berger@intel.com>
Change-Id: Idacba4abc5a33492e2de06522c446fd68230ea6b
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/15080
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Kamil Godzwon <kamilx.godzwon@intel.com>
Reviewed-by: Karol Latecki <karol.latecki@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>

autotest.sh

@@ -66,8 +66,6 @@ freebsd_update_contigmem_mod
 # More information: https://github.com/spdk/spdk/issues/1693
 CC_TYPE=$(grep CC_TYPE mk/cc.mk)
 if hash lcov && ! [[ "$CC_TYPE" == *"clang"* ]]; then
-	# setup output dir for unittest.sh
-	export UT_COVERAGE=$out/ut_coverage
 	export LCOV_OPTS="
 		--rc lcov_branch_coverage=1
 		--rc lcov_function_coverage=1

test/unit/unittest.sh

@@ -180,8 +180,10 @@ else
 fi
 if [ "$cov_avail" = "yes" ]; then
 	# set unit test output dir if not specified in env var
-	if [ -z ${UT_COVERAGE+x} ]; then
+	if [[ -z $output_dir ]]; then
 		UT_COVERAGE="ut_coverage"
+	else
+		UT_COVERAGE=$output_dir/ut_coverage
 	fi
 	mkdir -p $UT_COVERAGE
 	export LCOV_OPTS="