By Elisa Martinuzzi, Christian Kraemer and Tom Sims LONDON (Reuters) -Five years after Deutsche Bank and Commerzbank aborted an attempt to merge, an uncertain outlook for bank profitability and Germany’s need to plug a hole in its budget have rekindled speculation about a potential deal. Germany has said it is looking at all options to raise funds by selling stakes in some of the 100 or more companies it owns. Though a sale of its remaining 15% holding in Commerzbank is not imminent, Finance Minister Christian Lindner is open to a disposal and ultimately would prefer the government exiting the…