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-pyasn1/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-pyasn1
 PKG_VERSION:=0.4.8
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PYPI_NAME:=pyasn1
 PKG_HASH:=aef77c9fb94a3ac588e87841208bdec464471d9871bd5050a287cc9a475cd0ba
@@ -22,18 +22,13 @@ include ../pypi.mk
 include $(INCLUDE_DIR)/package.mk
 include ../python3-package.mk
 
-define Package/python-pyasn1/Default
+define Package/python3-pyasn1
   SECTION:=lang
   CATEGORY:=Languages
   SUBMENU:=Python
   TITLE:=ASN.1 library for Python
   URL:=https://github.com/etingof/pyasn1
-endef
-
-define Package/python3-pyasn1
-$(call Package/python-pyasn1/Default)
-  DEPENDS:=+PACKAGE_python3-pyasn1:python3-light
-  VARIANT:=python3
+  DEPENDS:=+python3-light
 endef
 
 define Package/python3-pyasn1/description
@@ -41,8 +36,6 @@ This is an implementation of ASN.1 types and codecs in Python programming
 language. It has been first written to support particular protocol (SNMP)
 but then generalized to be suitable for a wide range of protocols
 based on ASN.1 specification.
-.
-(Variant for Python3)
 endef
 
 $(eval $(call Py3Package,python3-pyasn1))