1. Remove the executor from the constructor of the class RcsCapabilityExchangeImplBase
2. Rename the API name from removeCapabilityExchangeImpl to destroyCapabilityExchangeImpl
Bug: 180616706
Test: atest RcsUceAdapterTest ImsServiceTest
Change-Id: I9c11e384992345886d9c4a744dd4d734884a303f