added option to map multiple cname hosts to multiple local origins

[udnaan]

This add support for multiple local origin through a single cloudflared process.
Config file example to use it is as follows:

hostname: public.opus.ai
 # default url that will use any requests not coming through cname hosts
url: http://192.168.3.10:8080
logfile: ./cloudflared.log
origincert: ./cert.pem
no-autoupdate: true
host-to-origin:
    # first service cnamed to public.example.com
    - service1.opus.ai=http://localhost:8080
    # second service cnamed to public.example.com
    - service2.opus.ai=http://192.168.3.10:8080
   .... # and so on

Note that each service still needs to be cnamed manually in cloudflare panel. It should be possible to use the api through the service itself but I haven't explored it yet.

[udnaan]

Addresses #59

[sudarshan-reddy]

Closing thus because this now exists as ingress rules.