By Renee Maltezou and James Mackenzie BRUSSELS/ATHENS (Reuters) - Greek Prime Minister Alexis Tsipras is set to begin a bruising week by clearing out party rebels opposed to an austerity package that will have to go through parliament within days, people close to the government say. The revolt saw 17 deputies from the government benches withhold support in a vote to authorise bailout negotiations, leaving Tsipras reliant on opposition parties to pass the measure. Dealing with the consequences of that revolt will provide a clear signal of how determined Tsipras will be in pushing through the reforms European partners are demanding.