[server] Make connection pooler configurable and set better default values
Drop the configuration connections-pool-size and add new configurations options:
* connections-pool-min-size. Set to 0 by default so we open connections only
when needed. This avoid opening min-size*processes connections at startup,
which is, it think, a good default.
* connections-pool-max-size. Set to 0 (unlimited) by default, so we move the
bottleneck to postgresql.
* connections-idle-timeout. Set to 10 minutes. I don't have arguments about
this except that this is the default in pgbouncer.
<html>
<head>
<!-- dependencies -->
<script type="text/javascript">
var JSON_BASE_URL = '';
</script>
<script type="text/javascript" src="/data/jquery.js"></script>
<script src="/data/cubicweb.js" type="text/javascript"></script>
<script src="/data/cubicweb.htmlhelpers.js" type="text/javascript"></script>
<script src="/data/cubicweb.python.js" type="text/javascript"></script>
<script src="/data/cubicweb.compat.js" type="text/javascript"></script>
<script src="/data/cubicweb.ajax.js" type="text/javascript"></script>
<!-- qunit files -->
<script type="text/javascript" src="/devtools/qunit.js"></script>
<link rel="stylesheet" type="text/css" media="all" href="/devtools/qunit.css" />
<!-- test suite -->
<script src="/devtools/cwmock.js" type="text/javascript"></script>
<script src="test_ajax.js" type="text/javascript"></script>
</head>
<body>
<div id="main"> </div>
<h1 id="qunit-header">cubicweb.ajax.js functions tests</h1>
<h2 id="qunit-banner"></h2>
<ol id="qunit-tests">
</body>
</html>