Fix config file locating code in blah.py. HTCONDOR-521

Use the same location logic as the C and shell code.

src/scripts/blah.py

@@ -1,11 +1,21 @@
 """Common functions for BLAH python scripts"""
 
+import os
 from configparser import RawConfigParser
 from io import StringIO
 
 class BlahConfigParser(RawConfigParser, object):
 
-    def __init__(self, path='/etc/blah.config', defaults=None):
+    def __init__(self, path=None, defaults=None):
+        if path is None:
+            if "BLAHPD_CONFIG_LOCATION" in os.environ:
+                path = os.environ['BLAHPD_CONFIG_LOCATION']
+            elif "BLAHPD_LOCATION" in os.environ and os.path.isfile("%s/etc/blah.config" % os.environ['BLAHPD_LOCATION']):
+                path = "%s/etc/blah.config" % os.environ['BLAHPD_LOCATION']
+            elif "GLITE_LOCATION" in os.environ and os.path.isfile("%s/etc/blah.config" % os.environ['GLITE_LOCATION']):
+                path = "%s/etc/blah.config" % os.environ['GLITE_LOCATION']
+            else:
+                path = "/etc/blah.config"
         # RawConfigParser requires ini-style [section headers] but since
         # blah.config is also used as a shell script we need to fake one
         self.header = 'blahp'