Android support for getting network addresses and interfaces (#1056)

* Replace unsupported network functions for android

* Refactor default/android net addresses processing

* Add default connection values, Refactor netenv

* Fix compilation error

* Combine network change default/android functions

netenv/os_default.go

@@ -0,0 +1,15 @@
+//go:build !android
+
+package netenv
+
+import (
+	"net"
+)
+
+func osGetInterfaceAddrs() ([]net.Addr, error) {
+	return net.InterfaceAddrs()
+}
+
+func osGetNetworkInterfaces() ([]net.Interface, error) {
+	return net.Interfaces()
+}