Logging related fixes

- logs to system.err instead of system.out
- disable spring-boot banner

headless-services/commons/commons-language-server/src/main/resources/application.properties

@@ -0,0 +1 @@
+spring.main.banner-mode=off

headless-services/commons/commons-language-server/src/main/resources/logback.xml

@@ -0,0 +1,15 @@
+<configuration>
+
+  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+    <!-- encoders are assigned the type
+         ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
+    <target>System.err</target>
+    <encoder>
+      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+    </encoder>
+  </appender>
+
+  <root level="info">
+    <appender-ref ref="STDOUT" />
+  </root>
+</configuration>

headless-services/commons/commons-language-server/src/main/resources/simplelogger.properties

@@ -1 +0,0 @@
-#org.slf4j.simpleLogger.log.org.springframework.ide.vscode.commons.languageserver.util.SimpleWorkspaceService=debug