* mbedtls-2.16: (28 commits)
Bump version to Mbed TLS 2.16.3
Changelog entry
Check for zero length and NULL buffer pointer
ssl-opt.sh: wait for proxy to start before running the script further
Fix uninitialized variable in x509_crt
HMAC DRBG: Split entropy-gathering requests to reduce request sizes
Fix the license header of hkdf
Add a change log entry
Add a test for mlaformed ECJPAKE context
Fix handling of md failure
Add a test for signing content with a long ECDSA key
Add documentation notes about the required size of the signature buffers
Add missing MBEDTLS_ECP_C dependencies in check_config.h
Change size of preallocated buffer for pk_sign() calls
Adapt ChangeLog
Fix mpi_bigendian_to_host() on bigendian systems
Add ChangeLog entry for new function
Add ChangeLog entry
Correct deterministic ECDSA behavior
Add warning for alternative ECDSA implementations
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