Under DBus it is possible to have methods and signals with the same name
or have methods which are reserved c++ keywords.
For example the logind session interface has a signal and method both
called Lock.
This patch allows generated methods to use a different method name
specified in the annotation that the original DBus name in the DBus
interface in a similar manner to how one can rename accessors.
[ChangeLog][QtDBus] Add annotation org.qtproject.QtDBus.MethodName to allow
autogenerating C++ methods with different names to the original DBus method
Change-Id: I08bbe77554fbdd348e93f82d45bab0d75d360c27
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>