Segmentation fault when connecting using TLS/SSL

[ejscribner]

We're seeing a segmentation fault when trying to connect using TLS (connection string prefixed with couchbases instead of just couchbase).

This is particularly relevant when connecting to a Capella cluster, which only allows TLS connection.

The segmentation fault appears to arise from the ensureCollections() function.

[ejscribner]

If possible, lets also add tests to cover TLS connection