[#2166] Fix shellcheck complaint

pgsql_tests.sh.in - replaced use of backticks ``
with $() per shellcheck.

diff --git a/src/bin/admin/tests/pgsql_tests.sh.in b/src/bin/admin/tests/pgsql_tests.sh.in
index bce1981003216012fb7305cd0ea57c58dc2b5ea3..5fdd8b78e3402eb7a74b81bc2ac410f17d356065 100644 (file)
--- a/src/bin/admin/tests/pgsql_tests.sh.in
+++ b/src/bin/admin/tests/pgsql_tests.sh.in
@@ -330,7 +330,7 @@ select get_session_big_int('kea.test_val'); \
         pgsql_execute "$session_sql"
 
     assert_eq 0 "${EXIT_CODE}" "session variable handling broken. (expected status code %d, returned %d)"
-    clean_out=`echo ${OUTPUT} | tr '\n' ' '`
+    clean_out=$(echo ${OUTPUT} | tr '\n' ' ')
     assert_str_eq "0 0 987 987 987 984 1984 " "${clean_out}" "session variable output incorrect"
 }