Remove python rules

• Remove poor Python rules
  • python/cgi/rule-import_httpoxy.yml - Not vulnerable since 2016 https://bugs.python.org/issue27568
  • python/crypto/rule-import_pyghmi.yml - Old rule from 2013 https://www.cisa.gov/news-events/alerts/2013/07/26/risks-using-intelligent-platform-management-interface-ipmi
  • python/escaping/rule-mark_safe.yml - Duplicate of rule-django.yml
  • python/exception/rule-try_except_continue.yml - Not a security rule
  • python/exception/rule-try_except_pass.yml - Not a security rule
  • python/ftp/rule-import_ftplib.yml - Duplicate rule, see rule-ftplib.yml
  • python/https/rule-httpsconnection.yml - Software Composition Analysis (SCA) problem, not a SAST problem (flag if python < 3.4.3 and HTTPSConnection is used)
  • python/secrets/ - enable secret detection instead (gitlab-org/gitlab#368492 (closed))
  • python/telnet/rule-telnetlib.yml - Duplicate of rule-import_telnib.yml
  • python/tmpdir/rule-specialdir.yml - It is perfectly fine to use /dev/shm as a tmpfs. Rule for using /tmp/ directly is flagged in rule-hardcodedtmp.yml
  • python/tmpdir/rule-tempnam.yml - tempnam was removed in Python 3, Python 2.7 is no longer supported
  • python/urlopen/rule-urllib_urlopen2.yml - Duplicate of rule-urllib_urlopen1.yml and also missing patterns
  • python/xml/rule-import_pickle.yml - Duplicate rule, see deserialization/rule-pickle.yml
  • python/xml/rule-import_... - Removed all import rules as they are just duplicates of the other rules

See gitlab-org/gitlab#417389 (closed)