Retry strategy for flaky tests

Lager changes the error level of supervisor progress messages from
info to debug. This is done after the hwm checking changes the received
message count. This PR implements a fix by removing one from the count
if no message was sent.

Closes: #496

Windows requires that file handles be closed prior to renaming files. In
addition, the inode on non-Unix OSes is always zero. This PR closes the
log files prior to rotation (instead of after) and ensures the case
where the file descriptor is `undefined` is handled.

Closes #481

c998673eb0/src/cowboy_stream_h.erl (L153-L157)

By an unhappy accident, OTP21 added functionality for 'named' trace
functions. This has a pattern match that matches the old trace function
(a 2 tuple where the second element is itself a 2 tuple):

https://github.com/erlang/otp/pull/1781

This patch changes to using a versioned record (so we can extend the
tracing later if needed) and adds 3 more options to tracing; count,
timeout and format string.

Additionally, tracing an OTP process via start_link arguments is now
documented.

Was 16, is now 15 after we merged #475

The list comprehension fail on improper lists, use a recursive
call into pr/2 instead.

Fixes #477.

During further testing found one more bug in check_hwm
This fix is an addition to https://github.com/erlang-lager/lager/pull/467