bitbake: call the initConfiguration when reparsing

As it is implemented now, when parsing the configuration files is
needed, it also needs an initialization.
Also, implemented a function to create an extra configuration files
which can be used as postfile/prefiles when parsing.

Signed-off-by: Cristiana Voicu <cristiana.voicu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
hob: replace the init cooker with reset in order to keep the history

When the cooker initialization is called, the variables history is lost.
It need a reset, in order to load the configuration files.
Also, concatenated the value for INHERIT variable.

Signed-off-by: Cristiana Voicu <cristiana.voicu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
hob: save variables in conf/ directory

Until now the variables were saved in bitbake configuration,
now they are saved in configuration files, in order to be read by
bitbake-worker. This helps to assure the consistency for the rest
of the variables.

Signed-off-by: Cristiana Voicu <cristiana.voicu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>