Greentea DNS tests workaround due to NSAPI DNS bug/deadlock with Nanostack.

Tests sequence swaped:
ASYNCHRONOUS_DNS_TIMEOUTS
ASYNCHRONOUS_DNS_INVALID_HOST
This is temporary solution to prevent Jenkins fail until root cause will be fixed.

Author: tymoteuszblochmobica

TESTS/netsocket/dns/main.cpp

@@ -214,8 +214,8 @@ Case cases[] = {
     Case("ASYNCHRONOUS_DNS_CANCEL", ASYNCHRONOUS_DNS_CANCEL),
 #ifndef MBED_CONF_CELLULAR_OFFLOAD_DNS_QUERIES
     Case("ASYNCHRONOUS_DNS_EXTERNAL_EVENT_QUEUE", ASYNCHRONOUS_DNS_EXTERNAL_EVENT_QUEUE),
-    Case("ASYNCHRONOUS_DNS_INVALID_HOST", ASYNCHRONOUS_DNS_INVALID_HOST),
     Case("ASYNCHRONOUS_DNS_TIMEOUTS", ASYNCHRONOUS_DNS_TIMEOUTS),
+    Case("ASYNCHRONOUS_DNS_INVALID_HOST", ASYNCHRONOUS_DNS_INVALID_HOST),
 #endif
     Case("ASYNCHRONOUS_DNS_SIMULTANEOUS_REPEAT",  ASYNCHRONOUS_DNS_SIMULTANEOUS_REPEAT),
     Case("SYNCHRONOUS_DNS", SYNCHRONOUS_DNS),