N°2013 Setup : fix crash on compilation if initial DB info were wrong

Use case :
- having in the iTop config file wrong DB parameters (unreachable server for example)
- launch the setup in update mode
- fix the DB config in the wizard

The PR #351 solved the errors that were happening in the following steps.
But we still had an error during compilation, caused by the maintenance mode activation.

setup/applicationinstaller.class.inc.php

@@ -286,8 +286,9 @@ class ApplicationInstaller
 						}
 					}
 
+					$aParamValues = $this->oParams->GetParamForConfigArray();
 					self::DoCompile($aSelectedModules, $sSourceDir, $sExtensionDir, $sTargetDir, $sTargetEnvironment,
-						$bUseSymbolicLinks);
+						$bUseSymbolicLinks, $aParamValues);
 
 					$aResult = array(
 						'status' => self::OK,
@@ -510,7 +511,22 @@ class ApplicationInstaller
 	}
 
 
-	protected static function DoCompile($aSelectedModules, $sSourceDir, $sExtensionDir, $sTargetDir, $sEnvironment, $bUseSymbolicLinks = null)
+	/**
+	 * @param array $aSelectedModules
+	 * @param string $sSourceDir
+	 * @param string $sExtensionDir
+	 * @param string $sTargetDir
+	 * @param string $sEnvironment
+	 * @param boolean $bUseSymbolicLinks
+	 * @param array $aParamValues
+	 *
+	 * @return void
+	 * @throws \ConfigException
+	 * @throws \CoreException
+	 *
+	 * @since 3.1.0 N°2013 added the aParamValues param
+	 */
+	protected static function DoCompile($aSelectedModules, $sSourceDir, $sExtensionDir, $sTargetDir, $sEnvironment, $bUseSymbolicLinks = null, $aParamValues = [])
 	{
 		SetupLog::Info("Compiling data model.");
 
@@ -520,7 +536,7 @@ class ApplicationInstaller
 
 		if (empty($sSourceDir) || empty($sTargetDir)) {
 			throw new Exception("missing parameter source_dir and/or target_dir");
-		}		
+		}
 
 		$sSourcePath = APPROOT.$sSourceDir;
 		$aDirsToScan = array($sSourcePath);
@@ -554,6 +570,7 @@ class ApplicationInstaller
 			{
 				$oConfig = null;
 			}
+			$oConfig->UpdateFromParams($aParamValues);
 			SetupUtils::EnterMaintenanceMode($oConfig);
 		}