mapper: Generate an environment file

Mapper will soon consume four command line arguments that
limit the scope of watched path and interface namespaces.

Add tooling to generate this environment file based on a
new bitbake variables.

Add xyz-openbmc_project and org-openbmc by default in the
Phosphor layer and other layers can add additional namespaces
as needed.

Change-Id: I1c03aa91b75d03652a8a8fb80737553fef224fdf
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
2 files changed