Update slingstart maven plugin to 1.7.0 in all projects to avoid build problems using the reactor

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1776436 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 0940d6d..d610d73 100644
--- a/pom.xml
+++ b/pom.xml
@@ -111,7 +111,7 @@
       <plugin>
         <groupId>org.apache.sling</groupId>
         <artifactId>slingstart-maven-plugin</artifactId>
-        <version>1.4.4</version>
+        <version>1.7.0</version>
         <extensions>true</extensions>
         <executions>
           <execution>