bats log: differentiate parallel tests from sequential

For tests run in parallel, show file number as |nnn| (vs [nnn])

Teach logformatter to distinguish the two, adding 'p' to anchors
in parallel tests. Necessary because in this scheme we run bats
twice, thus see 'ok 1' twice, and we want to differentiate them.

Signed-off-by: Ed Santiago <santiago@redhat.com>

test/system/helpers.bash

@@ -160,7 +160,12 @@ function basic_setup() {
 
     # Test filenames must match ###-name.bats; use "[###] " as prefix
     run expr "$BATS_TEST_FILENAME" : "^.*/\([0-9]\{3\}\)-[^/]\+\.bats\$"
-    BATS_TEST_NAME_PREFIX="[${output}] "
+    # If parallel, use |nnn|. Serial, [nnn]
+    if [[ -n "$PARALLEL_JOBSLOT" ]]; then
+        BATS_TEST_NAME_PREFIX="|${output}| "
+    else
+        BATS_TEST_NAME_PREFIX="[${output}] "
+    fi
 
     # By default, assert() and die() cause an immediate test failure.
     # Under special circumstances (usually long test loops), tests