kernel manifest: remove depreciated method.

  Kernel manifest will now go in
  .repo/local_manifests/kernel_manifest.xml to comply with the
  newer versions of repo. This will also give the user the ability
  to organize their local manifest by name.

PS2: - remove old local_manifest.xml if present
     - create local_manifests folder if not present

PS3: - safely merge old local_manifest.xml if present

Change-Id: I5871dd4facecf7c632181f93fdf32a9f4be72810
Signed-off-by: KhasMek <Boushh@gmail.com>
Merge "kernel manifest: remove depreciated method." into jb-mr1