Give more time to provider details fragment to appear, because debugging makes the code run slowly.

Turn on VPN touching that button, and leave the image as a mere indicator.

I've removed the "reason" management in LogWindowWrapper, letting
EipStatus display the error log message only if it's a new one (based on
the log buffer position).

I had a difficult moment trying to detect if the LogWindow had already
been shown after an error. Finally, I implemented a LogWindowWrapper
which contains a field for the reason it was shown, so that we can check
if the previous error is the same than the current one leading to the
avoidance of the second LogWindow. For this to work, we need to reset
that reason each time we trigger a new vpn state (i.e. each time the
user taps on the vpn icon).