MEDIUM: httpclient: disable SSL when the ca-file couldn't be loaded

Emit a warning when the ca-file couldn't be loaded for the httpclient,
and disable the SSL of the httpclient.

We must never be in a case where the verify is disabled without any
configuration, so better disable the SSL completely.

Move the check on the scheme above the initialization of the applet so
we could abort before initializing the appctx.
1 file changed