Drop Requires on python-dogpile-core (#1422716).
Also:
- Provide and obsolete python-dogpile-core.
- Replace the description with upstream's new description, and make
it a global.
- Make the summary a global.
- Rename python-dogpile-cache to python2-dogpile-cache.
- Use the license macro.
Signed-off-by: Randy Barlow <randy@electronsweatshop.com>