Enable mvn site for Honeycomb

Enable mvn site for Honeycomb

To deploy site into docs.fd.io

Works on top of:
https://gerrit.fd.io/r/#/c/3073/
Site distribution configuration:
https://gerrit.fd.io/r/#/c/3073/5/common/honeycomb-parent/pom.xml

... only Ubuntu14 deploys the site during merge job

Note: using site instead of site:site, since only with site we
can hook in groovy maven plugin to fix some generated links. With
site:site, the groovy maven plugin does not get executed.

Change-Id: Ie1086b8d20856dbe15992e67ccc0d15547ce56d3
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>