populate_sdk_ext: consider custom configuration in local.confChenQi/populate_sdk_ext_2_fixes

Copy the contents of local.conf under TOPDIR into the final generated
local.conf. In this way, custom settings are also made into the final
local.conf like IMAGE_INSTALL, DISTRO_FEATURES, VIRTUAL-RUNTIME_xxx, etc.

Before this change, installing extensible SDK would usually report failure
when preparing the build system if the user has custom configuration for
DISTRO_FEATURES in local.conf. Also, items in IMAGE_INSTALL_append in local.conf
also don't get built correctly.

This patch solves the above problem.

A blacklist mechanism is also introduced so that we can blacklist variables that
should not be copied into the final local.conf file. Currently, the blacklist
contains 'TMPDIR', 'SSTATE_DIR', 'DL_DIR', 'STAMPS_DIR', 'BASE_WORKDIR' and
'DEPLOY_DIR'. What these variables have in common is that they are set in
bitbake.conf using '?=' or '??='.

In addition, we check to avoid any setting that might lead to host path
bleeding into SDK's configuration.

[YOCTO #7616]

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>

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