Fix printf problems with high ascii characters after r413586 (1.8).

In r413586 (1.8) various casts were added to silence gcc 4.10 warnings.
Those fixes included things like:

    -out += sprintf(out, "%%%02X", (unsigned char) *ptr);
    +out += sprintf(out, "%%%02X", (unsigned) *ptr);

That works for low ascii characters, but for the high range that yields
e.g. FFFFFFC3 when C3 is expected.

This changeset:
- fixes those casts to use the 'hh' unsigned char modifier instead
- consistently uses %02x instead of %2.2x (or other non-standard usage)
- adds a few 'h' modifiers in various places
- fixes a 'replcaes' typo
- dev/urandon typo (in 13+ patch)

Review: https://reviewboard.asterisk.org/r/4263/

ASTERISK-24619 #close
Reported by: Stefan27 (on IRC)
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Merged revisions 429673 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 429674 from http://svn.asterisk.org/svn/asterisk/branches/12
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Merged revisions 429675 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@429683 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_rtp_asterisk.c

@@ -1347,7 +1347,7 @@ static int ast_rtp_dtls_set_configuration(struct ast_rtp_instance *instance, con
 		}
 
 		for (i = 0; i < size; i++) {
-			sprintf(local_fingerprint, "%.2X:", (unsigned)fingerprint[i]);
+			sprintf(local_fingerprint, "%02hhX:", fingerprint[i]);
 			local_fingerprint += 3;
 		}
 
@@ -1509,7 +1509,7 @@ static void ast_rtp_dtls_set_fingerprint(struct ast_rtp_instance *instance, enum
 	rtp->remote_hash = hash;
 
 	while ((value = strsep(&tmp, ":")) && (pos != (EVP_MAX_MD_SIZE - 1))) {
-		sscanf(value, "%02x", (unsigned int*)&rtp->remote_fingerprint[pos++]);
+		sscanf(value, "%02hhx", &rtp->remote_fingerprint[pos++]);
 	}
 }