bitbake.conf & package.bbclass: Use default SUMMARY and DESCRIPTION
A new default SUMMARY and DESCRIPTION was defined for any package that
previously did not contain one. This value is based on the original
SUMMARY_${PN} value.
The new default SUMMARY and DESCRIPTION is used as a basis for all of
the automatic summary and descriptions for the various package splits,
include ${PN}, ${PN}-dbg, ${PN}-dev, ${PN}-doc, and locales.
A recipe may also override any of the automatic summaries by simply
specifying the value.
Signed-off-by: Mark Hatle <mark.hatle@windriver.com>