Fix detection of .kexi file types after recent change of mime database on...

Fix detection of .kexi file types after recent change of mime database on Linux for SQLite type (2018-06-17)

Details: Add application/vnd.sqlite3 and application/x-vnd.kde.kexi to be sure everything is catch while detecting .kexi file types.
The change is apparently needed after this commit:

https://cgit.freedesktop.org/xdg/shared-mime-info/commit/freedesktop.org.xml.in?id=36a88b01f6ae90da35a2f6a072db159c84cea768

From https://cgit.freedesktop.org/xdg/shared-mime-info/tree/freedesktop.org.xml.in:
it's apparent that .kexi mime type still inherits from application/x-sqlite3 which is now only an alias:


<mime-type type="application/x-kexiproject-sqlite3">
    <_comment>Kexi database file-based project</_comment>
    <sub-class-of type="application/x-sqlite3"/>
    <glob pattern="*.kexi"/>
    <alias type="application/x-vnd.kde.kexi"/>

Also update the driver's autotest.

BUG:396999
FIXED-IN:3.2.0

Big thanks to therapon@netzero.com for extensive testing!

CCMAIL:therapon@netzero.com
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