FS-5755 part 2

rtp_secure_media=true
--inbound: Accept the srongest supported offered crypto suite, MUST result in a negotiated crypto or aborts.

--outbound: offer all supported crypto suites, MUST result in a negotiated crypto or aborts.

rtp_secure_media=optional
--inbound: Accept the srongest supported offered crypto suite, fall back to no crypto if no valid ones accepted.

--outbound: offer all supported crypto suites, OPTIONAL result in a negotiated crypto falls back to no crypto.

rtp_secure_media=<suite1>,<suiteN>
--inbound:  same behaviour as rtp_secure_media=true with smaller set of acceptable suites.
--outbound: offer supplied crypto suites, same behaviour as rtp_secure_media=true with smaller set of suites.

src/include/switch_types.h

@@ -2329,7 +2329,6 @@ typedef enum {
 	AES_CM_192_HMAC_SHA1_32,
 	AES_CM_128_HMAC_SHA1_32,
 	AES_CM_128_NULL_AUTH,
-	NO_CRYPTO,
 	CRYPTO_INVALID
 } switch_rtp_crypto_key_type_t;