turn off http2 for TLS setups for now (#11523)

due to lots of issues with x/net/http2, as
well as the bundled h2_bundle.go in the go
runtime should be avoided for now.

https://github.com/golang/go/issues/23559
https://github.com/golang/go/issues/42534
https://github.com/golang/go/issues/43989
https://github.com/golang/go/issues/33425
https://github.com/golang/go/issues/29246

With collection of such issues present, it
make sense to remove HTTP2 support for now

go.mod

@@ -70,7 +70,6 @@ require (
 	github.com/prometheus/client_golang v1.8.0
 	github.com/prometheus/client_model v0.2.0
 	github.com/prometheus/procfs v0.2.0
-	github.com/quasilyte/go-ruleguard v0.2.1 // indirect
 	github.com/rjeczalik/notify v0.9.2
 	github.com/rs/cors v1.7.0
 	github.com/secure-io/sio-go v0.3.1
@@ -80,7 +79,6 @@ require (
 	github.com/tidwall/gjson v1.6.7
 	github.com/tidwall/sjson v1.0.4
 	github.com/tinylib/msgp v1.1.3
-	github.com/ttacon/chalk v0.0.0-20160626202418-22c06c80ed31 // indirect
 	github.com/valyala/tcplisten v0.0.0-20161114210144-ceec8f93295a
 	github.com/willf/bitset v1.1.11 // indirect
 	github.com/willf/bloom v2.0.3+incompatible