Remove stale copy of context.py
Remove stale copy of context.py

Change-Id: I2d09873ddb7a9ef688308cfdbe6deb1959cdd2ac

dims/oslo.messaging,stevei101/oslo.messaging,apporc/oslo.messaging,magic0704/oslo.messaging,dukhlov/oslo.messaging,dims/oslo.messaging,apporc/oslo.messaging,hkumarmk/oslo.messaging,isyippee/oslo.messaging,hkumarmk/oslo.messaging,ozamiatin/oslo.messaging,magic0704/oslo.messaging,zhurongze/oslo.messaging,dukhlov/oslo.messaging,isyippee/oslo.messaging,ozamiatin/oslo.messaging,zhurongze/oslo.messaging,stevei101/oslo.messaging