upload-watch: remove busy-wait for SIGUSR1

Unconditional checking of SIGUSR1 flag in the idle source of main loop
causes 100% CPU usage.

hanle_sigusr() function and got_sigusr flag are not necessary because
abrt-upload-watch already implements signal handling based on usage of
GIO Channels.

Closes rhbz#1063317

Signed-off-by: Jakub Filak <jfilak@redhat.com>
turn off Autoreporting

Closes rhbz#1051480

Signed-off-by: Jakub Filak <jfilak@redhat.com>