Security update for python3

This update for python3 fixes the following issues:

- Fixed CVE-2020-27619 (bsc#1178009), where Lib/test/multibytecodec_support
calls eval() on content retrieved via HTTP.
- Change setuptools and pip version numbers according to new wheels
- Handful of changes to make python36 compatible with SLE15 and SLE12
(jsc#ECO-2799, jsc#SLE-13738)
- add triplets for mips-r6 and riscv
- RISC-V needs CTYPES_PASS_BY_REF_HACK

Update to 3.6.12 (bsc#1179193)

* Ensure python3.dll is loaded from correct locations when Python is embedded
* The __hash__() methods of ipaddress.IPv4Interface and ipaddress.IPv6Interface
incorrectly generated constant hash values of 32 and 128 respectively. This
resulted in always causing hash collisions. The fix uses hash() to generate
hash values for the tuple of (address, mask length, network address).
* Prevent http header injection by rejecting control characters in
http.client.putrequest(…).
* Unpickling invalid NEWOBJ_EX opcode with the C implementation raises now
UnpicklingError instead of crashing.
* Avoid infinite loop when reading specially crafted TAR files using the tarfile
module

- This release also fixes CVE-2020-26116 (bsc#1177211) and CVE-2019-20907 (bsc#1174091).

Update to 3.6.11:

- Disallow CR or LF in email.headerregistry. Address
arguments to guard against header injection attacks.
- Disallow control characters in hostnames in http.client, addressing
CVE-2019-18348. Such potentially malicious header injection URLs now
cause a InvalidURL to be raised. (bsc#1155094)
- CVE-2020-8492: The AbstractBasicAuthHandler class
of the urllib.request module uses an inefficient regular
expression which can be exploited by an attacker to cause
a denial of service. Fix the regex to prevent the
catastrophic backtracking. Vulnerability reported by Ben
Caller and Matt Schwager.

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1174571
python-Sphinx is missing the runtime dependency on python-packaging
bnc#1155094
VUL-0: CVE-2019-18348: python,python36,python3,python27: CRLF injection via the host part of the url passed to urlopen()
bnc#1177211
VUL-1: CVE-2020-26116: python,python36,python3,python27,python-urllib3: CRLF injection via HTTP request method in httplib/http.client
bnc#1174091
VUL-1: CVE-2019-20907: python,python36,python3,python27: in Lib/tarfile.py an attacker is able to craft a TAR archive leading to an infinite loop when opened by tarfile.open, because _proc_pax lacks header validation
bnc#1174701
Python 3.4 tests have tendency to timeout (probably somewhere around concurrency and multiprocessing, but not sure)
bnc#1178009
VUL-0: CVE-2020-27619: python36,python3: Lib/test/multibytecodec_support calls eval() on content retrieved via HTTP
bnc#1179193
Update python 3.6.10 -> 3.6.12
bnc#1179630
Build of python3 documentation is not independent on the version of Sphinx
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