Try to scan_ccache() after leash picks a cache

Try to scan_ccache() after leash picks a cache

We need to call scan_ccache() in order to notice that there
are credentials and read their expire time.

The call to scan_ccache() in the Leash case was inadvertently
removed as part of commit 8651f3339ccc5a623172a8edfb9cf522883acacd.

(cherry picked from commit 674f7d7abe2d4f8bc3fe791e4347a332e3ccfd41)

ticket: 8012 (new)
version_fixed: 1.12.3
subject: gssapi.dll tries to get initial creds even when some are present
status: resolved