Use saneyaml instead of yaml

[Hritik14]

saneyaml is maintained by us (nexB) and it makes sense to update all the importers to use it instead of yaml.
Files currently requiring the fix.

• - importers/suse_backports.py
• - importers/elixir_security.py
• - importers/istio.py
• - importers/mozilla.py
• - importers/alpine_linux.py
• - tests/test_alpine.py
• - tests/test_suse_backports.py
• - helpers.py

[sbs2001]

@pombredanne is there any advantage of using saneyaml over standard yaml . AFAIK there is yaml.safe_load , we really don't do nything else with it here.

[sbs2001]

After discussion with @pombredanne I'm convinced that yaml is insane, and there is value in using saneyaml .

[Hritik14]

@sbs2001 imho, if you could post that conversation here, it would be very helpful for future contributors.

[Hritik14]

Rationale:

>>> yaml.load("phil: yes")
{'phil': True}