yaml: use selected user and not admin for onchange

Fixes: #1885
yaml: use selected user and not admin for defaults
[REF] Packaging: Backport of v8 packaging

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[FIX] sql_db: close db connexions before removing them.

Closes #831 aka lp 1322191
[FIX] event onchange event type

Courtesy of Alejandro Santana

Closes: #1046, #1047
Merge pull request #1886 from lepistone/7.0-fix-yaml-onchange-user

use selected user and not admin to run yaml tests
[FIX] decode_header is broken in Python 2.

As explained in [1]_, the function email.header.decode_header may give
the wrong results.  For instance, an email with subject "e-mail reçu"
will lose the white space between the words.

Using future_ solves the issue.

.. [1] http://bugs.python.org/issue1079