Fix WiFiClientRxBuffer::fillBuffer() error, likely solves issue #2212#2259

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Jeroen88 wants to merge 3 commits intoespressif:masterfrom

Jeroen88:bugfix/WiFiClient

Commits on Jan 1, 2019

Fix WiFiClientRxBuffer::fillBuffer() error in handing a negative res from the call to recv()
Jeroen88
committed
Add logging in fillBuffer() if allocation of buffer fails
Jeroen88
committed

Commits on Jan 2, 2019

Remove BLE subdirectory
Jeroen88
committed