Confusing "new" TLS scheme option vs old `useSSL`

[particleflux]

2.0.18 added support for scheme tls in f96b872

That adapts the connection string to tls:// instead of tcp://.

BUT we already had useSSL.
Imho there's a bunch of problems with having two options for kinda the same thing.

• what happens if I set scheme to tls and useSSL to true? will the stream_socket_client() magically enable TLS but the useSSL do it again via stream_socket_enable_crypto()? Or will it throw an error?
• useSSL => true should probably also switch the scheme in the connectionString, as that is a public getter/property
• it's just plain confusing with two options