Add configuration parameters for handlers

[fmezou]

Rational

The handlers do not have any configuration parameters. It would be useful to tune some handlers by setting some attributes (locale, target...) in the configuration file (application section).

[fmezou]

Solution

One way is to use an arbitrary argument lists for the init method of the cots.core.BaseProduct class, and pass all key value pairs read (only the application section) from the configuration file to the cots.core.get_handler function. This latter use the qualname item and pass all the paramters (**kwargs) to the init method.