nnc: dynamic library interface (#228)

nnc: dynamic library interface (#228)

* nnc: dynamic library interface

This commit implements interface for loading dynamic libraries
and calling its interfaces.

This functional will be used to load and communicate with plugins.

Signed-off-by: Vitaliy Cherepanov <v.cherepanov@samsung.com>
* nnc: dynamic library interface

move sources to contrib/nnc

Signed-off-by: Vitaliy Cherepanov <v.cherepanov@samsung.com>
* nnc: dynamic library interface

fix namespaces and code style

Signed-off-by: Vitaliy Cherepanov <v.cherepanov@samsung.com>
* nnc: dynamic library interface

fix build

Signed-off-by: Vitaliy Cherepanov <v.cherepanov@samsung.com>
* nnc: dynamic library interface

add info to "<<" operator

Signed-off-by: Vitaliy Cherepanov <v.cherepanov@samsung.com>
* nnc: dynamic library interface

fix issues

Signed-off-by: Vitaliy Cherepanov <v.cherepanov@samsung.com>
* nnc: dynamic library interface

fix issues

Signed-off-by: Vitaliy Cherepanov <v.cherepanov@samsung.com>