bitbake-dev: add a setVariable command

This is synonymous with the getVariable command and allows you to set values
in the data dictionary.

bitbake-dev/lib/bb/command.py

@@ -125,6 +125,15 @@ class CommandsSync:
 
         return bb.data.getVar(varname, command.cooker.configuration.data, expand)
 
+    def setVariable(self, command, params):
+        """
+        Set the value of variable in configuration.data
+        """
+        varname = params[0]
+        value = params[1]
+        bb.data.setVar(varname, value, command.cooker.configuration.data)
+
+
 class CommandsAsync:
     """
     A class of asynchronous commands