revertws (#17216)

* Revert "MM-34000: Use non-epoll mode for TLS connections (#17172)"

This reverts commit 2743089b54.

* Revert "MM-33233: Fix double close of webconn pump (#17026)"

This reverts commit 0f98620b65.

* Revert "MM-33836: Detect and upgrade incorrect HTTP version for websocket handshakes (#17142)"

This reverts commit 4c5ea07aff.

* revert i18n

* Revert "MM-21012: Revamp websocket implementation (#16620)"

This reverts commit a246104d04.

* fix go.mod

* Trigger CI

go.mod

@@ -34,7 +34,6 @@ require (
 	github.com/go-redis/redis/v8 v8.6.0 // indirect
 	github.com/go-resty/resty/v2 v2.5.0 // indirect
 	github.com/go-sql-driver/mysql v1.5.0
-	github.com/gobwas/ws v1.1.0-rc.2
 	github.com/golang-migrate/migrate/v4 v4.14.1
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
 	github.com/golang/snappy v0.0.2 // indirect
@@ -68,7 +67,6 @@ require (
 	github.com/ledongthuc/pdf v0.0.0-20200323191019-23c5852adbd2
 	github.com/lib/pq v1.9.0
 	github.com/magefile/mage v1.11.0 // indirect
-	github.com/mailru/easygo v0.0.0-20190618140210-3c14a0dc985f
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattermost/go-i18n v1.11.0
 	github.com/mattermost/gorp v1.6.2-0.20200624165429-2595d5e54111