Fix mempool size for swap.cfg

Fix mempool size for swap.cfg

Fixing an error re-introduced in the swap.cfg file. The mempool size
needs to be bigger than the number of rx and tx descriptors (we need
some extra buffers in the mempool for other things than rx and tx
descriptors). The default number of tx and rx descriptors has been
changed in PROX to 2K. This initially went through the testing since
this is just giving a warning in the prox.log file for some PMDs. For
other PMDs, PROX will not start.
Also fixed an inconsistency in rapid.vms: name of the security group.

Change-Id: If95677bd6169a16da1b3b2a56d13936a854c385e
Signed-off-by: Luc Provoost <luc.provoost@intel.com>