API: Add the get_version implementation to messaging service
API: Add the get_version implementation to messaging service

This patch adds the implementation to the get_version.
After this patch the following url will be available:
messaging_service/version?addr=127.0.0.1

Signed-off-by: Amnon Heiman <ed5fc74c4692051ad0b19749fd7cea6ec2d74b9e@scylladb.com>

raphaelsc/scylla,duarten/scylla,avikivity/scylla,avikivity/scylla,kjniemi/scylla,avikivity/scylla,scylladb/scylla,duarten/scylla,kjniemi/scylla,kjniemi/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla,raphaelsc/scylla,raphaelsc/scylla,duarten/scylla