dns: Change lookup failures from LOG_ERROR to debug 1.

dns.c and dns_system_resolver.c were spitting out errors for lookup
failures for things like not finding a SRV record even though
there was an A record.  Those have been changed to debug messages.
Logging not finding ANY record is left to the higher level caller.

Also, dns_system_resolver was using Windows line endings so I
converted them to Unix style.  The actual log changes are on lines
156 and 159.

Change-Id: I65be16ea15304b96f9dcb4d289dbd3e2286fc094

main/dns.c

@@ -558,7 +558,7 @@ enum ast_dns_search_result ast_search_dns_ex(void *context, const char *dname, i
 	                                  sizeof(dns_response));
 
 	if (dns_response_len < 0) {
-		ast_log(LOG_ERROR, "DNS search failed for %s\n", dname);
+		ast_debug(1, "DNS search failed for %s\n", dname);
 		response_handler(context, (unsigned char *)"", 0, ns_r_nxdomain);
 		return AST_DNS_SEARCH_FAILURE;
 	}

main/dns_system_resolver.c

@@ -36,6 +36,7 @@ ASTERISK_REGISTER_FILE()
 #include "asterisk/dns_resolver.h"
 #include "asterisk/linkedlists.h"
 #include "asterisk/taskprocessor.h"
+#include "asterisk/utils.h"
 
 /*! \brief The consideration priority for this resolver implementation. */
 #define DNS_SYSTEM_RESOLVER_PRIORITY INT_MAX
@@ -152,10 +153,10 @@ static int dns_system_resolver_process_query(void *data)
 
 	/* Handle the possible return values from the DNS search */
 	if (res == AST_DNS_SEARCH_FAILURE) {
-		ast_log(LOG_ERROR, "DNS search failed for query: '%s'\n",
+		ast_debug(1, "DNS search failed for query: '%s'\n",
 		        ast_dns_query_get_name(query));
 	} else if (res == AST_DNS_SEARCH_NO_RECORDS) {
-		ast_log(LOG_WARNING, "DNS search failed to yield any results for query: '%s'\n",
+		ast_debug(1, "DNS search failed to yield any results for query: '%s'\n",
 		        ast_dns_query_get_name(query));
 	}