report-error.bbclass: add local.conf/auto.conf into error report
sometimes, it is not enough to reproduce a failed build with current
info on error reports web, add local.conf/auto.conf into error
report to make it more easier to reproduce failed build
Note: this need work together with change in repo error-report-web,
which will display local.conf and auto.conf as Error Details
[YOCTO #13252]
Signed-off-by: Changqing Li <changqing.li@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
