Put extra requested fields into different cache files

From: Liping Ke <[email protected]>

Below four patches are for putting extra requested fields inito different cache files instead of using only on bb_cache.dat. Now image creator need extra three fields. And in the future, there might be more similar requests. For each extra requestor, we will save the requested fields data into a separate cache files so that those who don't need it will not be impacted with larger fields and large data files.

Pull URL: git://git.pokylinux.org/poky-contrib.git
Branch: lke/cache_impl
Browse: http://git.pokylinux.org/cgit.cgi/poky-contrib/log/?h=lke/cache_impl

Thanks,
Liping Ke <[email protected]>
---

Liping Ke (4):
Introduce new param bitbake_mode into Cache.py Split Cache Data Retrieve method from Data Fields Introduce Extra required fields for image creator Implement independent cache for Extra Cache Fields Request

 bitbake/lib/bb/cache.py  |  189 +++++++++++++++++++++++++++++++++++++---------
 bitbake/lib/bb/cooker.py |   55 ++++++++++----
 2 files changed, 193 insertions(+), 51 deletions(-)