distrodata.bbclass: Add fetch2 handlers to svn case in checkpkg

distrodata.bbclass: Add fetch2 handlers to svn case in checkpkg

The existing code in checkpkg from distrodata.bbclass had similar
functionality with fetch when searching for latest package version.

For packages that use svn protocol that part was rewrote in order
to use fetcher API.
It now calls latest_revision method from Svn class in fetch2 so
that it gets latest version.

[ YOCTO #1813 ]

(From OE-Core rev: 2686b92bbab88cc777fdc0e4dded5aeabca7ac77)

Signed-off-by: Irina Patru <irina.patru@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>