Add tls to gin apiserver

[Gregory-Pereira]

Addresses: #361
Looking for feedback:

1. In a subsection of the buildHTTPClient function which previously lived in the sendPostRequest method for the API server, I load in the server CA certificate, which I am not sure I need.
2. The way I have implemented buildHTTPClient function, it will first try to generate an HTTPS client, and if it fails reading the keys it will instead generate an HTTP client with an error describing as much, and those errors will get picked out of the sendPostRequest function and ignored with appropriate logging. Is this an acceptable implementation? Or if the user specifies they want an HTTPS sessions, and it fails, should the API server just fail to spin?

Changes:

• env support for the apiserver
• TLS Secure client enablement

PTAL @vishnoianil @nerdalert

[vishnoianil]

I think you don't need to load it for the client, but the root ca need to be locally deployed (mkcert -i in the apiserver container to make the http request. For prod I think we need to update ansible to make sure that it generates the cert/keys/rootca and deploy those in the gobot http server as well as the apiserver client.

On the side note, I think things will be much better and cleaner once we move to kuberentes/ocp/kind for cert management.

[vishnoianil]

I think let's take these as an input parameter only. We should probably move to urfave/cli? It does pretty clean job with these 3 options. Irrespective of that, I think it would be good if we take care of this (checking env variable) across all the go binaries on the repo in separate PR? wdyt?

[vishnoianil]

I think we should introduce a "dev" flag, that basically means --tls-insecure or http. Switching to insecure connection because the tls handshake failed is not a good idea in my opinion. in non-dev mode, if tls fails, just fail, log error and exit. In dev mode, just use --tls-insecure or even http. That will give user the behavior they are expecting from these cli flags.

[vishnoianil]

I think you also need to fix the deploy/compose/deplo