SLING-2849 : Sample integration tests fail on Java 7

Use the 7-SNAPSHOT version of the launchpad for integration tests since
it supports Java 7. Also removed the /system/console/shell check from
OsgiConsoleTest since it doesn't seem to be included in the launchpad
anymore.


git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1477948 13f79535-47bb-0310-9956-ffa450edef68