In CouchDB's CI the small_pipeline test intermittently fails with
something like:

```
in function ibrowse_tests:'-small_pipeline/0-fun-5-'/1 (test/ibrowse_tests.erl, line 150)
  {line,150},
  {expression,"Counts"},
  {expected,"\n\n\n\n\n\n\n\n\n\n"},
  {value,"\n\n\n\n\n\n\n\n\t\n"}]}
```

Increasing the timeout a bit seems to help in local tests.

`ssl:ssl_acceppt` is deprecated. We use the `OTP_RELEASE` define which exists
on OTP 21+ only.

Connections warned of badargs to ets:delete
when shutting the server down with open connections;
created noise while reviewing test results.

Algorithm change had bug where ets:select return
value was incorrectly assumed to be the object key
and not the entire object causing the following
delete attempt based on a matchspec and the key to fail.

This meant that ets was not updated to reflect the completed
requests on each connection and causing exaustion of pipelines
event though connections were idle.  Functional test added which
demonstrated the problem.

Added additional functional tests ensuring that
the pipelines empty and added some robustness
around the test server.

Big commit. Switched algorithm to one which will favor
the connection with the smallest pipeline first
(deciding ties by timestamp of last finished request,
and then by pid as ultimate tie breaker).

Note: this also drastically changes the internal
representation of the connection in ets and is dependent
on specific order of operations when changing key values
to limit risk of race conditions between loadbalancer
and a given connection.

Also removed connection reporting of start of request
as this was no longer necessary since the load balancer
tees up the entry into ets with a 1.

In preparation for work to ensure that request
load is balanced across connections, created failing
functional test to demonstrate current behavior.

New endpoint will never send back a response and can
be used for verifying timeouts and long running processes.

New eunit based test harness for functional
tests that require a running test server in
order to run.

Moved receive of stop message to listening process
instead of connection and modified listener to come
up for air every once in a while to process.

Move src/ibrowse_test.erl file to the test directory.

As specified in the following RFC:  http://www.ietf.org/rfc/rfc2732.txt