Use CentOS-Vault repo

Merge pull request #23 from jouvin/add_option_insecure

Add option --insecure + documentation improvements

Merge pull request #22 from indigo-iam/import-suspended-users

Add option to import suspended users and synchronize end time

Merge pull request #20 from indigo-iam/issue-17

Synchronise AUP

Add CSRF guard header to the get calls (#19)

added CSRF guard header to the the get calls

Ask for scim scopes

Don't install the test CA

Avoid the call to get_root_groups

The call produces a list with the top group (i.e. the VO) followed
by the top-level VOMS groups, failing if only the top group exists.
However the list is used only to get the first group (i.e. the VO)
to seed the recursive import of groups in IAM.

Fix #14

Log status code in case of HTTP error