python-packages: Clean up Makefiles

This removes:

* Python 3 variants (VARIANT:=python3)

* "for Python3" from package titles

* Package selection condition from package dependencies, e.g.
  +PACKAGE_python3-six:python3-light replaced with +python3-light

* "Default" package information sections, e.g.
  Package/python-six/Default removed and package details merged into
  Package/python3-six

* "(Variant for Python3)" from package descriptions

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/python-requests-oauthlib/Makefile

@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-requests-oauthlib
 PKG_VERSION:=1.3.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_MAINTAINER:=Eneas U de Queiroz <cotequeiroz@gmail.com>
 PKG_LICENSE:=ISC
@@ -20,28 +20,21 @@ include ../pypi.mk
 include $(INCLUDE_DIR)/package.mk
 include ../python3-package.mk
 
-define Package/python-requests-oauthlib/Default
+define Package/python3-requests-oauthlib
   SUBMENU:=Python
   SECTION:=lang
   CATEGORY:=Languages
   TITLE:=OAuthlib auth for Requests
   URL:=https://github.com/requests/requests-oauthlib
-endef
-
-define Package/python3-requests-oauthlib
-  $(call Package/python-requests-oauthlib/Default)
   DEPENDS:= \
-	+PACKAGE_python3-requests-oauthlib:python3 \
-	+PACKAGE_python3-requests-oauthlib:python3-oauthlib \
-	+PACKAGE_python3-requests-oauthlib:python3-requests
-  VARIANT:=python3
+	+python3 \
+	+python3-oauthlib \
+	+python3-requests
 endef
 
 define Package/python3-requests-oauthlib/description
   This python package provides first-class OAuth library support
   for Requests.
-.
-(Variant for Python3)
 endef
 
 $(eval $(call Py3Package,python3-requests-oauthlib))