API: add a workaround for the get schema_versions
API: add a workaround for the get schema_versions

This adds a workaround for the get schema_version, it will return only a
shcema version of the local node, this is a temporary workaround until
describe_schema_versions will be implemented.

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

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