test: run doctool tests in parallel

PR-URL: #47273
Refs: #47146
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Yagiz Nizipli <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: joyeecheung

test/doctool/testcfg.py

@@ -4,4 +4,4 @@
 import testpy
 
 def GetConfiguration(context, root):
-    return testpy.SimpleTestConfiguration(context, root, 'doctool')
+    return testpy.ParallelTestConfiguration(context, root, 'doctool')