Allow to configure multiple servers and connect. Introduce a new VTY
node to allow multiple servers. Add an explicit connect. Do not put
the main connection into the same list but assume it exists.
Change-Id: I9448ad4a005dd7c7eb1c615d03e57d6cb058ae4d
Use GNUtls because it is GPL compatible and instead of mbedTLS seems
to have a working non-blocking I/O integration. GNUtls has various
issues that could not be resolved easily:
* Pick spdy as sub protocol
* gmt_time not randomized
* private key loaded to RAM (but not verified)
This is the beginning and not the end. Client support might need more
work with actual tls verification. Maybe more manual x509 cert
verification is needed and maybe client certs don't work at all. I try
to ignore renegotiation as I threw away the key.
Reload x509 creds and keys as they might have changed from one
connection to another.
Change-Id: I9128e14084da1fc2705f858393f98b8133996172