cqlsh: ssl setting not read from cqlshrc in 3.11

With CASSANDRA-10458 an option was added to read the --ssl flag from cqlshrc, however the commit seems to have been incorrectly merged or the changes were dropped somehow.

Currently adding the following has no effect:

[connection]
ssl = true

When looking at the current tree it's obvious that the flag is not read: https://github.com/apache/cassandra/blame/cassandra-3.11/bin/cqlsh.py#L2247

However it should have been added with https://github.com/apache/cassandra/commit/70649a8d65825144fcdbde136d9b6354ef1fb911

The values like DEFAULT_SSL = False  are present, but the option_with_default() call is missing.

Git blame also shows no change to that line which would have reverted the change.