Add parser support for DoH configuration options

Add parser support for DoH configuration options

This commit adds stub parser support and tests for:
- an "https-server" global option for HTTP/2 configuration.
- an "https-endpoint" view option for DoH configuration.
- add specific -p options to set dns, tls, or https port numbers by
  specifying -p dns-PORT, -p tls=PORT, or -p https=PORT.  NOTE: this
  change only affects syntax; specifying the TLS port on the command
  line DOES NOT CURRENTLY HAVE ANY EFFECT.
- change option names to tls-port and https-port for consistency.
- change variable names in system tests to TLSPORT and HTTPSPORT,
  and report them when running tests.

Documentation for these options has also been added to the ARM, but
needs further work.