phpunit configuration improvement

This feature implement env parameters for phpUnit configuration.
This upgrade is a first step for multi influxdb version testing

phpunit.xml.dist

@@ -12,6 +12,18 @@
             <directory>tests</directory>
         </testsuite>
     </testsuites>
+    <php>
+        <env name="UDP_PORT" value="5551"/>
+        <env name="UDP_DB" value="udp.test"/>
+
+        <env name="TCP_PORT" value="8086"/>
+        <env name="TCP_DB" value="tcp.test"/>
+        <env name="TCP_PROTOCOL" value="http"/>
+
+        <env name="HOST" value="localhost"/>
+        <env name="USERNAME" value="root"/>
+        <env name="PASSWORD" value="root"/>
+    </php>
     <filter>
         <whitelist processUncoveredFilesFromWhitelist="true">
             <directory suffix=".php">src</directory>

tests/bootstrap.php

@@ -1,18 +1,18 @@
 <?php
 return [
     "tcp" => [
-        "host" => "localhost",
-        "port" => 8086,
-        "protocol" => "http",
-        "database" => "tcp.test",
-        "username" => "root",
-        "password" =>  "root",
+        "host" => getenv('HOST'),
+        "port" => getenv('TCP_PORT'),
+        "protocol" => getenv('TCP_PROTOCOL'),
+        "database" => getenv('TCP_DB'),
+        "username" => getenv('USERNAME'),
+        "password" =>  getenv('PASSWORD'),
     ],
     "udp" => [
-        "host" => "localhost",
-        "port" => 5551,
-        "database" => "udp.test",
-        "username" => "root",
-        "password" => "root"
+        "host" => getenv('HOST'),
+        "port" => getenv('UDP_PORT'),
+        "database" => getenv('UDP_DB'),
+        "username" => getenv('USERNAME'),
+        "password" =>  getenv('PASSWORD'),
     ],
 ];