bitbake: toaster: trigger SetBRBE event

Triggered MetadataEvent "SetBRBE" when TOASTER_BRBE variable
is set on bitbake server. This should make buildinfohelper
aware of the build request id, which is used to properly
report build status and failures back to Toaster.

(Bitbake rev: 8b136fb093020bc912a7b21d5163e1cd5fb12124)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/bldcontrol/localhostbecontroller.py

@@ -287,6 +287,9 @@ class LocalhostBEController(BuildEnvironmentController):
         # set variables
         for var in variables:
             bbctrl.setVariable(var.name, var.value)
+            if var.name == 'TOASTER_BRBE':
+                bbctrl.triggerEvent('bb.event.MetadataEvent("SetBRBE", "%s")' \
+                                     % var.value)
 
         # Add 'toaster' and 'buildhistory' to INHERIT variable
         inherit = {item.strip() for item in bbctrl.getVariable('INHERIT').split()}