Make SSL verification persistent

[alexandrevicenzi]

According to this insecure connection can be set on Session rather than in every request.

IMHO is better to set only once since you cannot change while the process is running.

[rohanpm]

I notice if insecure is used right now, it currently gives lots and lots of warnings like:

/usr/lib/python3.7/site-packages/urllib3/connectionpool.py:847: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
/usr/lib/python3.7/site-packages/urllib3/connectionpool.py:847: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
/usr/lib/python3.7/site-packages/urllib3/connectionpool.py:847: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
/usr/lib/python3.7/site-packages/urllib3/connectionpool.py:847: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
2019-03-21 17:27:22 +1000 [WARNING ] Input Debug repo does not exist
2019-03-21 17:27:22 +1000 [ERROR   ] Output Rpm repo does not exist
2019-03-21 17:27:22 +1000 [ERROR   ] Output Source repo does not exist
2019-03-21 17:27:22 +1000 [WARNING ] Output Debug repo does not exist
2019-03-21 17:27:22 +1000 [WARNING ] Skipping current content triplet, some repos are missing
2019-03-21 17:27:22 +1000 [INFO    ] Getting input repos for input content sets:
	rhel-8-for-s390x-baseos-rpms
	rhel-8-for-s390x-baseos-source-rpms
	rhel-8-for-s390x-baseos-debug-rpms
2019-03-21 17:27:22 +1000 [INFO    ] Getting output repos for output content sets:
	ubi-8-for-s390x-baseos-rpms
	ubi-8-for-s390x-baseos-source-rpms
	ubi-8-for-s390x-baseos-debug-rpms
/usr/lib/python3.7/site-packages/urllib3/connectionpool.py:847: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
/usr/lib/python3.7/site-packages/urllib3/connectionpool.py:847: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
/usr/lib/python3.7/site-packages/urllib3/connectionpool.py:847: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)

I'm wondering if this fix would also cut down on the number of warnings...

[alexandrevicenzi]

@rohanpm I guess not, I opened #14 to propose a solution for this.