Fixes #399

Florian Münchbach authored Feb 09, 2019 and Florian Münchbach committed Feb 24, 2019

This commit contains all changes starting with the first integration of
the plugin into the gajim_1.1 branch (76dabe2e) until the current plugin
version V3 (42b9aeb8).
The manifest.ini is updated for compatibility with upcoming Gajim
versions.

Delete sessions when we dont have an identity saved for it

It did not discard our own device when without_self was True