Disables watching the private key file for updates #12
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Previously, both the certificate and private key file were watched for changes and upon a change to either, both values were read and used to update the KeyManager. This caused an infrequent race-condition (see #8) where a mix of old and new data was left in the KeyManager until the next key/cert rotation. This resulted in apps that used client cert authentication to receive
bad_certificateerrors from the server side.This PR disables the Filewatcher & callback for the private key file, as changes to the certificate file alone should indicate the presence of new key & cert values since the cert will be updated after the key. Both new values will therefore be updated to the KeyManager upon a cert file change.
Fixes #8
Supersedes #10 & #9