Refactor TLSDNS module to work with libuv/ssl directly

Refactor TLSDNS module to work with libuv/ssl directly

* Following the example set in 634bdfb16d8, the tlsdns netmgr
  module now uses libuv and SSL primitives directly, rather than
  opening a TLS socket which opens a TCP socket, as the previous
  model was difficult to debug.  Closes #2335.

* Remove the netmgr tls layer (we will have to re-add it for DoH)

* Add isc_tls API to wrap the OpenSSL SSL_CTX object into libisc
  library; move the OpenSSL initialization/deinitialization from dstapi
  needed for OpenSSL 1.0.x to the isc_tls_{initialize,destroy}()

* Add couple of new shims needed for OpenSSL 1.0.x

* When LibreSSL is used, require at least version 2.7.0 that
  has the best OpenSSL 1.1.x compatibility and auto init/deinit

* Enforce OpenSSL 1.1.x usage on Windows

(cherry picked from commit e493e04c0fe94b24182832c89342869c55181748)