refactor(install): Exclude centreon config file from git

Move centreon.config.php to centreon.config.php.example and exclude from git.

Closes: CP7M18
BREAKING CHANGE:

Requires RPM-build logic rework, do not merge before it is applied!

.gitignore

@@ -3,3 +3,4 @@
 nbproject/
 /vendor/
 composer.lock
+config/centreon.config.php
\ No newline at end of file

config/centreon.config.php → config/centreon.config.php.example

@@ -10,6 +10,7 @@ $constants = array(
     '_CENTREON_LOG_' => '@CENTREON_LOG@',
     '_CENTREON_VARLIB_' => '@CENTREON_VARLIB@'
 );
+
 foreach ($constants as $name => $value) {
     if (!defined($name)) {
         define($name, $value);