esp8266: Include upip as a standard frozen bytecode module.

Previously, it was included only in release builds, but it's important
tool which should be always at the fingertips to be useful (and to
pump up its usage).

esp8266/modules/upip.py

@@ -0,0 +1 @@
+../../tools/upip.py

esp8266/modules/upip_utarfile.py

@@ -0,0 +1 @@
+../../tools/upip_utarfile.py