python3: merge python3-email into python3-urllib

As we're seeing in various test.sh scrip runs, importing 'email' fails
with not finding 'urllib' and vice-versa.

Then via a7e96ec91 ("python3-email: add python3-urllib as dependency")
I created a circular dependency.
So, might as well merge the two packages into one (named python3-urllib)
and updates all dependencies to pull python3-urllib.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/python/python3-find-stdlib-depends.sh

@@ -17,7 +17,6 @@ python3-ctypes: ctypes
 python3-dbm: dbm dbm.dumb dbm.gnu dbm.ndbm
 python3-decimal: decimal
 python3-distutils: distutils
-python3-email: email
 python3-logging: logging
 python3-lzma: lzma
 python3-multiprocessing: multiprocessing
@@ -27,7 +26,7 @@ python3-pydoc: doctest pydoc
 python3-readline: readline
 python3-sqlite3: sqlite3
 python3-unittest: unittest
-python3-urllib: urllib
+python3-urllib: urllib email
 python3-uuid: uuid
 python3-xml: xml xmlrpc
 "