python: fix RDEPENDS on several recipes, due to non-existent packages

The packaging has been altered slightly so ensure the dependencies are all still
valid.

(From OE-Core rev: 3328211afdef8ffb00dd4dff1143959d5412b075)

Signed-off-by: Alejandro Hernandez <alejandro.hernandez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python3-pip_9.0.1.bb

@@ -37,7 +37,6 @@ do_install_append() {
 RDEPENDS_${PN} = "\
   python3-compile \
   python3-io \
-  python3-enum \
   python3-html \
   python3-json \
   python3-netserver \