Add API descriptions of cynara-async-configuration calls
Add API descriptions of cynara-async-configuration calls

Introduce three new API calls specific for cynara_async_configuration
creation, destruction and cache size setting.

Change-Id: I51665a2885c6de3a49ebd30dcfc10a733707673b

Samsung/cynara,pohly/cynara,Samsung/cynara,pohly/cynara,Samsung/cynara,pohly/cynara