Introduce timeouts and TLS verification override

These options are identical to those introduced in swh-loader-git!177 (merged), which would help solving swh/meta#5077

assigned to @olasd

Jenkins job DLS/gitlab-builds #337 succeeded .
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approved this merge request

added 11 commits

• 772ffd28...65e51e29 - 8 commits from branch swh/devel:master
• 360a2f2c - pattern: introduce a requests_extra_kwargs parameter
• d8909899 - pattern: introduce shortcuts for connect and read timeouts
• 12e4da4e - pattern: introduce a verify_certs shortcut

Compare with previous version

Jenkins job DLS/gitlab-builds #338 failed .
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