Fix package exports in org.eclipse.jgit MANIFEST.MF

Do not export o.e.j.internal.transport.parser as public package;
restrict visibility to org.eclipse.jgit.test only.

Add two packages that were not listed at all (o.e.j.internal.revwalk
and o.e.j.internal.submodule) marked as x-internal:=true.

Change-Id: I9188356075515ad354b724102fbd6304b682de6a
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

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

@@ -62,6 +62,7 @@ Export-Package: org.eclipse.jgit.annotations;version="5.2.0",
  org.eclipse.jgit.internal;version="5.2.0";x-friends:="org.eclipse.jgit.test,org.eclipse.jgit.http.test",
  org.eclipse.jgit.internal.fsck;version="5.2.0";x-friends:="org.eclipse.jgit.test",
  org.eclipse.jgit.internal.ketch;version="5.2.0";x-friends:="org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
+ org.eclipse.jgit.internal.revwalk;version="5.2.0";x-internal:=true,
  org.eclipse.jgit.internal.storage.dfs;version="5.2.0";
   x-friends:="org.eclipse.jgit.test,
    org.eclipse.jgit.http.server,
@@ -80,7 +81,8 @@ Export-Package: org.eclipse.jgit.annotations;version="5.2.0",
  org.eclipse.jgit.internal.storage.reftable;version="5.2.0";
   x-friends:="org.eclipse.jgit.http.test,org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
  org.eclipse.jgit.internal.storage.reftree;version="5.2.0";x-friends:="org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
- org.eclipse.jgit.internal.transport.parser;version="5.2.0",
+ org.eclipse.jgit.internal.submodule;version="5.2.0";x-internal:=true,
+ org.eclipse.jgit.internal.transport.parser;version="5.2.0";x-friends:="org.eclipse.jgit.test",
  org.eclipse.jgit.lib;version="5.2.0";
   uses:="org.eclipse.jgit.revwalk,
    org.eclipse.jgit.treewalk.filter,