[Drbd-dev] DRBD-8: update to fault insertion testing

[Graham, Simon]

 <<drbd-testing.patch>> Made a few improvements to the fault insertion
test suite - still needs more work but it should test a wider range of
things now. Right now, the trunk version does not pass these tests - it
gets through inserting meta-data faults on read and write on the local
node as 'drbdadm attach' is done but then fails pretty quickly if
meta-data write faults on the remote node are inserted as attach is done
- this results in the connection being torn down and I cant directly
reconnect because of the issue with 'drbdadm connect' I reported
earlier. If I do 'drbdadm disconnect' and then 'drbdadm connect', it
works on the primary side (where I was doing the attach), but the other
side gets into a Disconnecting state from which it doesn't recover (the
connection was actually taken down when the fault occurred earlier on).

I'm still investigating the cause of this, but I suspect there is a hole
in the new Disconnecting state handling.

I also fixed a problem with the test agent code -- when it was spinning
waiting for the state to change to an expected value, it would run as
fast as possible reading the current state and comparing - I added a .5s
usleep.

Anyway - patch attached; will enhance again to automatically reconnect
as needed once we sort out the problem with connect failing.

Simon


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