Created attachment 298008 [details] [review]
session: move some debug spew around

We end up printing "looking for session file" a bunch of times
in the log with no indication why.  This commit drops the message
and instead adds messages to the callers.

Created attachment 298009 [details] [review]
session: add more debug spew about session type

This should give a clearer picture about what session type
is getting picked when.

Created attachment 298010 [details] [review]
session: reset session type to default when selecting non-wayland session

If we select a non-wayland session we need to clear the session type,
or it will linger as a wayland session if it was one previously.

Prevents users from getting logged into an X session when with
XDG_SESSION_TYPE=wayland.

Attachment 298008 [details] pushed as a2b9812 - session: move some debug spew around
Attachment 298009 [details] pushed as 7241f8b - session: add more debug spew about session type
Attachment 298010 [details] pushed as 4e68490 - session: reset session type to default when selecting non-wayland session