Always verify TLS unless explicitly told otherwise

TLS was not being verified in a number of places:

- connections to grafana.com

- connections to OAuth providers when TLS client authentication was
  enabled

- connections to self-hosted Grafana installations when using the CLI
  tool

TLS should always be verified unless the user explicitly enables an
option to skip verification.

Removes some instances where `InsecureSkipVerify` is explicitly set to
`false`, the default, to help avoid confusion and make it more difficult
to regress on this fix by accident.

Adds a `--insecure` flag to `grafana-cli` to skip TLS verification.

Adds a `tls_skip_verify_insecure` setting for OAuth.

Adds a `app_tls_skip_verify_insecure` setting under a new `[plugins]`
section.

I'm not super happy with the way the global setting is used by
`pkg/api/app_routes.go` but that seems to be the existing pattern used.

pkg/api/login_oauth.go

@@ -97,7 +97,7 @@ func OAuthLogin(ctx *middleware.Context) {
 
 		tr := &http.Transport{
 			TLSClientConfig: &tls.Config{
-				InsecureSkipVerify: true,
+				InsecureSkipVerify: setting.OAuthService.OAuthInfos[name].TlsSkipVerify,
 				Certificates:       []tls.Certificate{cert},
 				RootCAs:            caCertPool,
 			},