Removing MD5 hash from releases as required by new Apache policy.

Changing location of checksum and type of checksum for release.
diff --git a/build-support/release/release-candidate b/build-support/release/release-candidate
index a982cf7..4547af6 100755
--- a/build-support/release/release-candidate
+++ b/build-support/release/release-candidate
@@ -228,7 +228,6 @@
 
   # Create the checksums
   echo "Creating checksums"
-  gpg --print-md MD5 ${dist_name}.tar.gz > ${dist_name}.tar.gz.md5
   shasum -a 512 ${dist_name}.tar.gz > ${dist_name}.tar.gz.sha512
 popd
 
@@ -293,8 +292,8 @@
 The release candidate is available at:
 ${aurora_svn_rc_url}/${dist_name}.tar.gz
 
-The MD5 checksum of the release candidate can be found at:
-${aurora_svn_rc_url}/${dist_name}.tar.gz.md5
+The SHA-512 checksum of the release candidate can be found at:
+${aurora_svn_rc_url}/${dist_name}.tar.gz.sha512
 
 The signature of the release candidate can be found at:
 ${aurora_svn_rc_url}/${dist_name}.tar.gz.asc