Attempts to read the contents of both the X.509 Certificates file and the PKCS#8
Private Key file and combine the contents into a javax.net.ssl.KeyManager
The singular value is returned in an Array for ease of use with
javax.net.ssl.SSLContext
init method.
A factory which can create a
javax.net.ssl.KeyManager
which contains an X.509 Certificate (or Certificate chain) and a PKCS#8 private key.