Add base version of Redis modules
Copied from Nokia internal RCP code repository, revision
d452b42d from
branch 'rcp2.0'.
No functional changes compared to above mentioned base version.
Documentation of the available commands added to README file.
Updated `Dockerfile.redis` so that Redis modules are built and
installed to image which is used as a basis for `redis-standalone`
pod.
Change-Id: I32bc59b4f0a60eb3683fdd31e295d57ee68d8430
Signed-off-by: Rolf Badorek <rolf.badorek@nokia.com>