DNS client is leaking memory like a drain about picotcp HOT 5 CLOSED

Identified two problems by now:

1. the function starting the dns query from stack endpoint wasn't mutexed between PicoTcp locks.
2. in pico_dns_client_del_query we were trying to remove from the wrong tree
   aka found = pico_tree_findKey(&NSTable, &test); correct is
   found = pico_tree_findKey(&DNSTable, &test);
   observe the subtle difference

Even after this fixes there still are memory leaks
Continuing the investigation...

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Each time we are losing 417 bytes.

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It seems this is a udp issue.
If you don't read the whole content of the input buffer but close the socket,
it doesn't clean up the used memory.

As an example I tried with mbed.org which returns 64 bytes and bug isn't reproducible
with google.com which returns > 256 bytes.

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Implemented a mechanism that clears the queues before killing the socket.
No more memory leak, these are the last moments for this bug

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Fixed in github rev #6faf379 + mbed rev #63.
Bye bye nasty bug.

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