Let Tycho handle metadata with default

The config for signing only makes it suspect for
eclipse-wildwebdeveloper#1505
.

pom.xml

@@ -277,23 +277,6 @@
 							</execution>
 						</executions>
 					</plugin>
-					<plugin>
-						<groupId>org.eclipse.tycho</groupId>
-						<artifactId>tycho-p2-plugin</artifactId>
-						<version>${tycho-version}</version>
-						<executions>
-							<execution>
-								<id>p2-metadata</id>
-								<phase>package</phase>
-								<goals>
-									<goal>p2-metadata</goal>
-								</goals>
-							</execution>
-						</executions>
-						<configuration>
-							<defaultP2Metadata>false</defaultP2Metadata>
-						</configuration>
-					</plugin>
 				</plugins>
 			</build>
 		</profile>