Add fingerprint for mbedtls 2.2.1 (latest release)
Add fingerprint for mbedtls 2.2.1 (latest release)

Fingerprint generated against Monkey HTTP Server v1.6.8

mattfoster/tls_prober,WestpointLtd/tls_prober,mattfoster/tls_prober,WestpointLtd/tls_prober