Adding url parameter for mscertsrv

[ctrought]

Before I submit a PR, as per contributing guide posting this for the maintainers to check. Our mscertsrv web enrolment server hosts two different CAs on the same server, and are served at different paths. For this reason, the hardcoded hostname + paths in the Certsrv package such as "https://{0}/certsrv/certnew.cer".format(self.server) do not allow us to use this with our web enrolment service which is actually hosted at https://{0}/certsrv/<other-ca>/certnew.cer".format(self.server).

Since it doesn't seem the original project is accepting PRs, I was thinking to only include the changes locally and add a new url parameter in the ca handler config. The existing host option would be preserved, but if the url option is supplied in the acme_srv.cfg it would use that instead.

Let me know your thoughts, and if you are alright if I submit the proposed PR.

[grindsa]

Hi,

your proposal makes sense so feel free to submit a PR.

/G.