network enhanecment / refactor (#361)

* chore(network): improve connectivity check

* refactor(network): rewrite network and timesync component

* feat(display): show cloud connection status

* chore: change logging verbosity

* chore(websecure): update log message

* fix(ota): validate root certificate when downloading update

* feat(ui): add network settings tab

* fix(display): cloud connecting animation

* fix: golintci issues

* feat: add network settings tab

* feat(timesync): query servers in parallel

* refactor(network): move to internal/network package

* feat(timesync): add metrics

* refactor(log): move log to internal/logging package

* refactor(mdms): move mdns to internal/mdns package

* feat(developer): add pprof endpoint

* feat(logging): add a simple logging streaming endpoint

* fix(mdns): do not start mdns until network is up

* feat(network): allow users to update network settings from ui

* fix(network): handle errors when net.IPAddr is nil

* fix(mdns): scopedLogger SIGSEGV

* fix(dhcp): watch directory instead of file to catch fsnotify.Create event

* refactor(nbd): move platform-specific code to different files

* refactor(native): move platform-specific code to different files

* chore: fix linter issues

* chore(dev_deploy): allow to override PION_LOG_TRACE

internal/logging/root.go

@@ -0,0 +1,20 @@
+package logging
+
+import "github.com/rs/zerolog"
+
+var (
+	rootZerologLogger = zerolog.New(defaultLogOutput).With().
+				Str("scope", "jetkvm").
+				Timestamp().
+				Stack().
+				Logger()
+	rootLogger = NewLogger(rootZerologLogger)
+)
+
+func GetRootLogger() *Logger {
+	return rootLogger
+}
+
+func GetSubsystemLogger(subsystem string) *zerolog.Logger {
+	return rootLogger.getLogger(subsystem)
+}