Add safety check and detection support to FI tool

This adds a safety check and detection mechanism to the
tools/test_format_inspector.py utility for verifying those features
outside of glance.

Change-Id: I447e7e51315472f8fa6013d4c4852f54c1e0c43d
(cherry picked from commit b27040b87e43ff4acfb6870ef0d13d54e5ca5caa)
(cherry picked from commit b394ef00c3426771092d099cf1d96077bfa4b919)
(cherry picked from commit aa12d39b453068d9ee8367591eb60d4a15cddece)
(cherry picked from commit a1c94b4)

Author: kk7ds

tools/test_format_inspector.py

@@ -102,6 +102,13 @@ def main():
         else:
             print('Confirmed size with qemu-img')
 
+    print('Image safety check: %s' % (
+        fmt.safety_check() and 'passed' or 'FAILED'))
+    if args.input:
+        detected_fmt = format_inspector.detect_file_format(args.input)
+        print('Detected inspector for image as: %s' % (
+            detected_fmt.__class__.__name__))
+
 
 if __name__ == '__main__':
     sys.exit(main())