framework: Cancel pending alarm during AVC analyses
    
    Previously the alarm was reset only in main DBUS thread and only when a new AVC
    appeared. In cases when there were several AVC messages in short time, analyses
    could take more than a default timeout and later analyses were not saved to
    the database. Now we cancel pending timeouts before analyze_avc() and reset the
    timeout back to default when it's done.
    
    Fixes:
        $ journalctl | grep 'sealert -l'
        setroubleshoot[314039]: SELinux is preventing bash from search access on the directory .local. For complete SELinux messages run: sealert -l ccf3307a-f4ab-4584-87c6-63884daf841a
    
        $ sealert -l ccf3307a-f4ab-4584-87c6-63884daf841a
        Error
        query_alerts error (1003): id (ccf3307a-f4ab-4584-87c6-63884daf841a) not found