Revert "Downspeed the read from USB flash during AUM USB unplug test"

This reverts commit c86d18a7.
The problem of low speed bandwidth is kernel crash (APERTIS-6016) which
completely blocking the USB unplug test.

With changes provided in previous commit we provide the binary diff
big enough to catch the proper timing by human and without kernel
crashes.

Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>

test-cases/apertis-update-manager-usb-unplug.yaml

@@ -48,10 +48,10 @@ run:
     - $ du -sh /usr/share/locale /usr/share/man /usr/share/zoneinfo
     - "Remove the initial deployment"
     - $ sudo ostree admin undeploy 1
-    - "Add udev rule for limiting the maximal read speed from USB drive to 64Kbps."
+    - "Add udev rule for limiting the maximal read speed from USB drive to 1MBps."
     - $ sudo tee /etc/udev/rules.d/99-usblimit.rules <<"EOF"
     - |
-        >KERNEL=="sd*", SUBSYSTEMS=="usb", ACTION=="add", ENV{DEVTYPE}=="disk", ENV{MAJOR}=="8", RUN+="/bin/sh -c 'echo $env{MAJOR}:$env{MINOR} 65536 > /sys/fs/cgroup/blkio/blkio.throttle.read_bps_device'"
+        >KERNEL=="sd*", SUBSYSTEMS=="usb", ACTION=="add", ENV{DEVTYPE}=="disk", ENV{MAJOR}=="8", RUN+="/bin/sh -c 'echo $env{MAJOR}:$env{MINOR} 1048576 > /sys/fs/cgroup/blkio/blkio.throttle.read_bps_device'"
         EOF
     - "Reboot the system"
     - "Check the current deployment"
@@ -60,12 +60,11 @@ run:
     - $ sudo journalctl -ef --unit apertis-update-manager &
     - "Plug the USB flash drive into the device"
     - "The update starts automatically"
-    - "Wait while the upgrade starts:"
+    - "Wait while the upgrade starts (5-20 seconds depending on your HW) and remove the USB flash drive before it is completed:"
     - |
         >Dec 19 22:31:46 apertis apertis-update-[390]: mount added : /media/test
         Dec 19 22:31:46 apertis apertis-update-[390]: Ostree static delta starting
         Dec 19 22:31:46 apertis apertis-update-[390]: Cannot check the ID in black list: No such file or directory
-    - "Wait for 5-20 seconds (depending on your HW) and remove the USB flash drive before it is completed."
     - "Update should be interrupted with error messages similar to"
     - |
         >[   59.542717] scsi 1:0:0:0: rejecting I/O to offline device