Implement new dsl_source_rtsp_tls_validation_flags_get/set services

[rjhowell44]

Need services to get/set the TLS Certificate validation flags for a named RTSP Source -- flags used to validate the server certificate
New DSL constant values

/**
 * @brief TLS certificate validation flags used to validate the 
 * RTSP server certificate.
 */
#define DSL_TLS_CERTIFICATE_UNKNOWN_CA                              0x00000001
#define DSL_TLS_CERTIFICATE_BAD_IDENTITY                            0x00000002
#define DSL_TLS_CERTIFICATE_NOT_ACTIVATED                           0x00000004
#define DSL_TLS_CERTIFICATE_EXPIRED                                 0x00000008
#define DSL_TLS_CERTIFICATE_REVOKED                                 0x00000010
#define DSL_TLS_CERTIFICATE_INSECURE                                0x00000020
#define DSL_TLS_CERTIFICATE_GENERIC_ERROR                           0x00000040
#define DSL_TLS_CERTIFICATE_VALIDATE_ALL                            0x0000007f

New Services

/**
 * @brief Gets the current connection validation flags for the named RTSP Source
 * @param[in] name name of the source object to query
 * @param[out] flags mask of DSL_TLS_CERTIFICATE constant values. 
 * Default = DSL_TLS_CERTIFICATE_VALIDATE_ALL.
 * @return DSL_RESULT_SUCCESS on success, DSL_RESULT_SOURCE_RESULT otherwise.
 */
DslReturnType dsl_source_rtsp_tls_validation_flags_get(const whcar_t* name,
    uint* flags);

/**
 * @brief Sets the connection validation flags for the named RTSP Source to use.
 * @param[in] name name of the source object to update
 * @param[in] flags mask of DSL_TLS_CERTIFICATE constant values. 
 * @return DSL_RESULT_SUCCESS on success, DSL_RESULT_SOURCE_RESULT otherwise.
 */
DslReturnType dsl_source_rtsp_tls_validation_flags_get(const whcar_t* name,
    uint flags);

[rjhowell44]

Work has been merged into the v0.27.alpha branch