*: Start process of possibly deprecating Solaris

*: Start process of possibly deprecating Solaris

The FRR community has run into an issue where keeping up our
CI system to work with solaris has become a fairly large burden.
We have also sent emails and asked around and have not found
anyone standing up saying that they are using Solaris.

Given the fact that we do not have any comprehensive testing
being done w/ solaris and the fact that we are getting a steady
stream of new features that will never work on solaris and
we cannot find anyone to say that they are using it.  Let's
start the drawn out process of deprecating the code.

If in the mean-time someone comes forward with the fact that
they are using it we can then not deprecate it.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>