contrib/dump_cache.py: make it can dump everything

Have a simple tool to dump bb_cache.dat is useful for investigating and
studying bitbake cache. The old contrib/dump_cache.py can dump pn, pv and
packages for it, now enhance it dump everything.

Here is the usage:
$ /path/to/dump_cache.py --help
usage: dump_cache.py [-h] [-r RECIPE] [-m MEMBERS] [-s] cachefile

bb_cache.dat's dumper

positional arguments:
  cachefile             specify bb_cache.dat

optional arguments:
  -h, --help            show this help message and exit
  -r RECIPE, --recipe RECIPE
                        specify the recipe, default: all recipes
  -m MEMBERS, --members MEMBERS
                        specify the member, use comma as separator for
                        multiple ones, default: all members
  -s, --skip            skip skipped recipes

Use dump_cache.py --help to get help

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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