Rename certcheck to check_cert

Change-Id: Idff8d4924171072c127c054bb4f8d1661fb3d700
Remove code that is already in pymisc

Change-Id: I168d2c10c2e19efb14109e16ce7b299e5e48d81b
Refactor get_cert_expiration error handling

Change-Id: If7f910d1fd1aad33a96f2cca22a518c512255024
Broken cert should be different thant ignored one

Change-Id: I546e74ad82a9a984951348dbe1205a3cd77326f6
Fix sample configuration

Change-Id: Ie871377192acedd57921d0425676f4b1ae226750
[doc] Fix dependencies and config info

Change-Id: Ib89d2e45b2efd28e23bfe8ad122bd2aa56149f71
Fix tests, add more tests

Change-Id: I8fb84ed3fb8cef17328094348ce1085fab2ddd6f