Fix manifests of source bundles

- don't mark them as singleton to allow coexistence of multiple versions
  in the same installation
- add missing version qualifier to Eclipse-SourceBundle header

see
https://dev.eclipse.org/mhonarc/lists/cross-project-issues-dev/msg10524.html

Change-Id: Ie4e028038f5a1d3e18b0be06c3d2ea82e7f9068d
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.archive/META-INF/SOURCE-MANIFEST.MF

@@ -1,7 +1,7 @@
 Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: org.eclipse.jgit.archive - Sources
-Bundle-SymbolicName: org.eclipse.jgit.archive.source;singleton:=true
+Bundle-SymbolicName: org.eclipse.jgit.archive.source
 Bundle-Vendor: Eclipse.org - JGit
 Bundle-Version: 3.4.0.qualifier
-Eclipse-SourceBundle: org.eclipse.jgit.archive;version="3.4.0";roots="."
+Eclipse-SourceBundle: org.eclipse.jgit.archive;version="3.4.0.qualifier";roots="."

org.eclipse.jgit.java7/META-INF/SOURCE-MANIFEST.MF

@@ -1,8 +1,8 @@
 Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: org.eclipse.jgit.java7 - Sources
-Bundle-SymbolicName: org.eclipse.jgit.java7.source;singleton:=true
+Bundle-SymbolicName: org.eclipse.jgit.java7.source
 Bundle-Vendor: Eclipse.org - JGit
 Bundle-Version: 3.4.0.qualifier
-Eclipse-SourceBundle: org.eclipse.jgit.java7;version="3.4.0";roots="."
+Eclipse-SourceBundle: org.eclipse.jgit.java7;version="3.4.0.qualifier";roots="."
 

org.eclipse.jgit.pgm/META-INF/SOURCE-MANIFEST.MF

@@ -1,7 +1,7 @@
 Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: org.eclipse.jgit.pgm - Sources
-Bundle-SymbolicName: org.eclipse.jgit.pgm.source;singleton:=true
+Bundle-SymbolicName: org.eclipse.jgit.pgm.source
 Bundle-Vendor: Eclipse.org - JGit
 Bundle-Version: 3.4.0.qualifier
-Eclipse-SourceBundle: org.eclipse.jgit.pgm;version="3.4.0";roots="."
+Eclipse-SourceBundle: org.eclipse.jgit.pgm;version="3.4.0.qualifier";roots="."

org.eclipse.jgit/META-INF/SOURCE-MANIFEST.MF

@@ -1,7 +1,7 @@
 Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: org.eclipse.jgit - Sources
-Bundle-SymbolicName: org.eclipse.jgit.source;singleton:=true
+Bundle-SymbolicName: org.eclipse.jgit.source
 Bundle-Vendor: Eclipse.org - JGit
 Bundle-Version: 3.4.0.qualifier
-Eclipse-SourceBundle: org.eclipse.jgit;version="3.4.0";roots="."
+Eclipse-SourceBundle: org.eclipse.jgit;version="3.4.0.qualifier";roots="."