This adds new console_ssl_ciphers and console_ssl_minimum_version
parameters for configuring the allowed TLS ciphers and minimum protocol
version to enforce for incoming client connections to the console proxy
services (VNC, SPICE, etc).
Depends-On: I23ac1cc79482d0fabb359486a4b934463854cae5
Change-Id: I3a1262f70f6a801db276701a39ebb01f40025192
Related-Bug: 1842149