Fixing duplicate label issue.

For projects that have multiple APIs documented simultaneously, if
the labels are the equal on more than one version of the API build
will fail due to duplicate label.
Adding a random number to minimize the chance of duplicate label.

Change-Id: Ic8434ce79630637a878fa64307796be0f3efe6d1

os_api_ref/__init__.py

@@ -12,6 +12,7 @@
 
 from collections import OrderedDict
 import os
+import random
 import re
 
 from docutils import nodes
@@ -198,7 +199,8 @@ class RestMethodDirective(rst.Directive):
 
         # We need to build a temporary target that we can replace
         # later in the processing to get the TOC to resolve correctly.
-        temp_target = "%s-selector" % node['target']
+        temp_target = "%s-%d-selector" % (node['target'],
+                                          random.randint(1, 1000))
         target = nodes.target(ids=[temp_target])
         self.state.add_target(temp_target, '', target, lineno)
         section += node