Fix hosts being in multiple groups, and duplicate host references in the same inventory file.

test/TestInventory.py

@@ -128,9 +128,9 @@ class TestInventory(unittest.TestCase):
         print vars
 
         expected = dict(
-            a='1', b='2', c='3', d='100002', 
+            a='1', b='2', c='3', d='100002', rga='1', rgb='2', rgc='3', 
             inventory_hostname='rtp_a', 
-            group_names=[ 'eastcoast', 'nc', 'rtp', 'us' ]
+            group_names=[ 'eastcoast', 'nc', 'redundantgroup', 'redundantgroup2', 'redundantgroup3', 'rtp', 'us' ]
         )
         print vars
         print expected

test/complex_hosts

@@ -12,6 +12,24 @@ florida
 [us:children]
 eastcoast
 
+[redundantgroup]
+rtp_a
+
+[redundantgroup2]
+rtp_a
+
+[redundantgroup3:children]
+rtp
+
+[redundantgroup:vars]
+rga=1
+
+[redundantgroup2:vars]
+rgb=2
+
+[redundantgroup3:vars]
+rgc=3
+
 [nc:vars]
 b=10000
 c=10001