Allow DNS override via --connect-to curl paramater

We have a need to validate changes in our akamai staging. This is possible by overriding DNS and connecting to akamai staging dns entries, instead of production.
For this the connect-to parameter of curl can be exposed for configuration.

An example of how this works:

curl --connect-to www.microsoft.com:443:www.microsoft.com-c-3.edgekey-staging.net https://www.microsoft.com

In the above example the DNS resolution of www.microsoft.com is changed to whatever ip www.microsoft.com-c-3.edgekey-staging.net returns. Allowing connection to the hostname while on a different ip than is in DNS.