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adbebc1892
1. A new implicit planner which extends the functionality provided by FirstFitPlanner. 2. Implicit planner can be used in either strict or preferred mode. In strict mode it tries to deploy a vm of a given account on a host on which vms of the account are already running. If no such host is found it'll search for an empty host to service the request. Otherwise the deploy vm request fails. 3. In preferred mode, if a host which is running vms of the account or an empty host isn't found, the planner then tries to deploy on any other host provided it isn't running implicitly dedicated strict vms of any other account. 4. Updated the createServiceOffering api to configure the details for the planner that the service offering is using. 5. Made db changes to store the service offering details for the planner. 6. Unit tests for testing the implicit planner functionality. 7. Marvin test for validating the functionality.