test-reexec: Add script to address issues when task re-execution

test-reexec: Add script to address issues when task re-execution

The script is used to address build issues when tasks of different
recipes are re-executed. The script goes through all available recipes
and their tasks. The test results are saved in ./reexeclogs. Force build
logs are saved with prefix "force". Build failure logs are saved with
prefix "failed".

[YOCTO #2123]

(From OE-Core rev: 6258a11f22103d68d02e329c2e7fb198202cc6ef)

Signed-off-by: Jiajun Xu <jiajun.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>