fs_config: add unit tests

Add some initial unit tests.

The unit tests themselves are inlined into the tool and
can be executed by running the "test" commandlet.

Example:
$ python -m unittest test_fs_config_generator.Tests
.............
----------------------------------------------------------------------
Ran 13 tests in 0.004s

OK

Test: run the test commandlet and observe for failures.

Change-Id: I1bada385fa841fd50fa958997d440f1198e15198
Signed-off-by: William Roberts <william.c.roberts@intel.com>

tools/fs_config/fs_config_generator.py

@@ -158,6 +158,12 @@ class AID(object):
         friendly = identifier[len(AID.PREFIX):].lower()
         self.friendly = AID._fixup_friendly(friendly)
 
+    def __eq__(self, other):
+
+        return self.identifier == other.identifier \
+            and self.value == other.value and self.found == other.found \
+            and self.normalized_value == other.normalized_value
+
     @staticmethod
     def is_friendly(name):
         """Determines if an AID is a freindly name or C define.
@@ -218,6 +224,12 @@ class FSConfig(object):
         self.path = path
         self.filename = filename
 
+    def __eq__(self, other):
+
+        return self.mode == other.mode and self.user == other.user \
+            and self.group == other.group and self.caps == other.caps \
+            and self.path == other.path and self.filename == other.filename
+
 
 class AIDHeaderParser(object):
     """Parses an android_filesystem_config.h file.