Revert "Don't run on H29, it has issues with accessing SNAPSHOT bundles"

This reverts commit fa912f05a5c53b4cd48ceb3c7a35af2e38b8a83d.

The ASF parent pom was wiped from the H29 slave, re-adding to try again.
diff --git a/vars/slingOsgiBundleBuild.groovy b/vars/slingOsgiBundleBuild.groovy
index 1a5734d..844597e 100644
--- a/vars/slingOsgiBundleBuild.groovy
+++ b/vars/slingOsgiBundleBuild.groovy
@@ -5,7 +5,7 @@
     def globalConfig = [
         availableJDKs : [ 8: 'JDK 1.8 (latest)', 9: 'JDK 1.9 (latest)', 10: 'JDK 10 (latest)', 11: 'JDK 11 (latest)' ],
         mvnVersion : 'Maven (latest)',
-        mainNodeLabel : 'ubuntu && !H29', // work around for INFRA-17796
+        mainNodeLabel : 'ubuntu',
         githubCredentialsId: 'sling-github-token'
     ]