Rohit Yadav 14504dc7e3 CLOUDSTACK-6432: Prevent DNS reflection attacks
DNS on VR should not be publically accessible as it may be prone to DNS
amplification/reflection attacks. This fixes the issue by only allowing VR
DNS (port 53) to be accessible from guest network cidr, as per the fix in:
https://issues.apache.org/jira/browse/CLOUDSTACK-6432

- Only allows guest network cidrs to query VR DNS on port 53.
- Includes marvin smoke test that checks the VR DNS accessibility checks from
  guest and non-guest network.
- Fixes Marvin sshClient to avoid using ssh agent when password is provided,
  previous some environments may have seen 'No existing session' exception without
  this fix.
- Adds a new dnspython dependency that is used to perform dns resolutions in the
  tests.

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
2016-08-30 22:39:33 +05:30
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