MB-12537: Couchbase Single Server is no longer supported

There is no need to have an install function to install a no longer
supported product.

Change-Id: I566cbec53f9a6de5bdc40fcb8e3036a5b3e22e9c
Reviewed-on: http://review.couchbase.org/42784
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>
Tested-by: buildbot <build@couchbase.com>