Remove redundant DROP rules.

Now that DROP is the default policy in ferm, no need for extra DROP
rules

Change-Id: I7fccf98db4d5c1491a85c2f867460387da669a71
Merge "Remove redundant DROP rules." into production
Allow ytterbium access to CI and gitblit

For git replications purposes

Change-Id: I864c9010d10c0cf057dbcbe372c0520495cd009e
Adding net-topology.py.erb to make hadoop topology aware.

This script contains a hardcoded dict that maps fqdns to
/datacenter/rack/row ids.  Hadoop will use these ids
to balance data between rows, and allocate jobs accordingly.

Change-Id: I0ceb0202cda86f6311d6e0b08c53067344d2c067
Merge "Allow ytterbium access to CI and gitblit" into production