sanity.bbclass: expand error messages for version checks
The ${WORKDIR} variable was not getting expanded (anymore?), leading to
less helpful error messages like:
Exception: NotImplementedError: Your version of bblayers.conf has the wrong LCONF_VERSION (has 7, expecting 8).
Please compare your file against bblayers.conf.sample and merge any changes before continuing.
"meld conf/bblayers.conf ${COREBASE}/meta*/conf/bblayers.conf.sample"
is a good way to visualise the changes.
ERROR: Execution of event handler 'check_sanity_eventhandler' failed
After adding expansion, embedding ${LCONF_VERSION} and ${LAYER_CONF_VERSION}
in the error message seems a bit more readable and consistent.
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
