Set the username in the neo4j client configuration.
@param config The neo4j client configuration to update.
@param username The username to authenticate with. The string will be
duplicated, and thus may point to temporary memory.
@return 0 on success, or -1 on error (errno will be set).
Set the username in the neo4j client configuration.
@param config The neo4j client configuration to update. @param username The username to authenticate with. The string will be duplicated, and thus may point to temporary memory. @return 0 on success, or -1 on error (errno will be set).