Added 'with_nested' lookup plugin that can easily do nested loops.

lib/ansible/runner/lookup_plugins/nested.py

+# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+
+def flatten(terms):
+    ret = []
+    for term in terms:
+        if isinstance(term, list):
+            ret.extend(term)
+        elif isinstance(term, tuple):
+            ret.extend(term)
+        else:
+            ret.append(term)
+    return ret
+
+def combine(a,b):
+    results = []
+    for x in a:
+        for y in b:
+            results.append([x,y])
+    return results
+
+class LookupModule(object):
+
+    def __init__(self, **kwargs):
+        pass
+
+    def run(self, terms, **kwargs):
+        if not isinstance(terms, list):
+            raise errors.AnsibleError("a list is required for with_nested")
+        my_list = terms[:]
+        result = []
+        if len(my_list) == 0:
+            raise errors.AnsibleError("with_nested requires at least one list")
+        result = my_list.pop()
+        while len(my_list) > 0:
+            result2 = combine(result, my_list.pop())
+            result  = result2
+        new_result = []
+        for x in result:
+            new_result.append(flatten(x))
+        return new_result
+
+