config: Cstring serialization.

config: Cstring serialization.

[Feature]       Serialization of null-terminated strings
[Cause]         N/A
[Solution]      Memory for serialized data is allocated with new,
                user should delete[] the field in the destructor
                or when it's not used.
[Verification]  Build, install, run tests.

Change-Id: Iff49e14ab95410bd7a80ee23abf04e9d92e65a55