Combine jimi-c and bcoca's ideas and work on hooking module-utils into PluginLoader.

This version just gets the relevant paths from PluginLoader and then
uses the existing imp.find_plugin() calls in the AnsiballZ code to load
the proper module_utils.

Modify PluginLoader to optionally omit subdirectories (module_utils
needs to operate on top level dirs, not on subdirs because it has
a hierarchical namespace whereas all other plugins use a flat
namespace).

Rename snippet* variables to module_utils*

Add a small number of unittests for recursive_finder

Add a larger number of integration tests to demonstrate that
module_utils is working.

Whitelist module-style shebang in test target library dirs

Prefix module_data variable with b_ to be clear that it holds bytes data

test/integration/targets/module_utils/module_utils/a/b/c/d/e/f/g/h/__init__.py

@@ -0,0 +1 @@
+data = 'abcdefgh'

test/integration/targets/module_utils/module_utils/bar0/foo.py

@@ -0,0 +1 @@
+data = 'bar0'

test/integration/targets/module_utils/module_utils/bar1/__init__.py

@@ -0,0 +1 @@
+data = 'bar1'

test/integration/targets/module_utils/module_utils/bar2/__init__.py

@@ -0,0 +1 @@
+data = 'bar2'

test/integration/targets/module_utils/module_utils/baz1/one.py

@@ -0,0 +1 @@
+data = 'baz1'

test/integration/targets/module_utils/module_utils/baz2/one.py

@@ -0,0 +1 @@
+data = 'baz2'

test/integration/targets/module_utils/module_utils/facts.py

@@ -0,0 +1 @@
+data = 'overridden facts.py'

test/integration/targets/module_utils/module_utils/foo.py

@@ -0,0 +1,3 @@
+#!/usr/bin/env python
+
+foo = "FOO FROM foo.py"

test/integration/targets/module_utils/module_utils/foo0.py

@@ -0,0 +1 @@
+data = 'foo0'

test/integration/targets/module_utils/module_utils/foo1.py

@@ -0,0 +1 @@
+data = 'foo1'

test/integration/targets/module_utils/module_utils/foo2.py

@@ -0,0 +1 @@
+data = 'foo2'

test/integration/targets/module_utils/module_utils/qux1/quux.py

@@ -0,0 +1 @@
+data = 'qux1'

test/integration/targets/module_utils/module_utils/qux2/quux.py

@@ -0,0 +1 @@
+data = 'qux2:quux'

test/integration/targets/module_utils/module_utils/qux2/quuz.py

@@ -0,0 +1 @@
+data = 'qux2:quuz'

test/integration/targets/module_utils/module_utils/spam1/ham/eggs/__init__.py

@@ -0,0 +1 @@
+data = 'spam1'

test/integration/targets/module_utils/module_utils/spam2/ham/eggs/__init__.py

@@ -0,0 +1 @@
+data = 'spam2'

test/integration/targets/module_utils/module_utils/spam3/ham/bacon.py

@@ -0,0 +1 @@
+data = 'spam3'

test/integration/targets/module_utils/module_utils/spam4/ham/bacon.py

@@ -0,0 +1 @@
+data = 'spam4'

test/integration/targets/module_utils/module_utils/spam5/ham/bacon.py

@@ -0,0 +1 @@
+data = 'spam5:bacon'

test/integration/targets/module_utils/module_utils/spam5/ham/eggs.py

@@ -0,0 +1 @@
+data = 'spam5:eggs'

test/integration/targets/module_utils/module_utils/spam6/ham/__init__.py

@@ -0,0 +1,2 @@
+bacon = 'spam6:bacon'
+eggs = 'spam6:eggs'

test/integration/targets/module_utils/module_utils/spam7/ham/__init__.py

@@ -0,0 +1 @@
+eggs = 'spam7:eggs'

test/integration/targets/module_utils/module_utils/spam7/ham/bacon.py

@@ -0,0 +1 @@
+data = 'spam7:bacon'

test/integration/targets/module_utils/module_utils/spam8/ham/__init__.py

@@ -0,0 +1 @@
+eggs = 'spam8:eggs'

test/integration/targets/module_utils/module_utils/spam8/ham/bacon.py

@@ -0,0 +1 @@
+data = 'spam8:bacon'

test/integration/targets/module_utils/module_utils/sub/bam.py

@@ -0,0 +1,3 @@
+#!/usr/bin/env python
+
+bam = "BAM FROM sub/bam.py"

test/integration/targets/module_utils/module_utils/sub/bam/bam.py

@@ -0,0 +1,3 @@
+#!/usr/bin/env python
+
+bam = "BAM FROM sub/bam/bam.py"

test/integration/targets/module_utils/module_utils/sub/bar/bam.py

@@ -0,0 +1,3 @@
+#!/usr/bin/env python
+
+bam = "BAM FROM sub/bar/bam.py"

test/integration/targets/module_utils/module_utils/sub/bar/bar.py

@@ -0,0 +1,3 @@
+#!/usr/bin/env python
+
+bar = "BAR FROM sub/bar/bar.py"

test/integration/targets/module_utils/module_utils/yak/zebra/foo.py

@@ -0,0 +1 @@
+data = 'yak'