cert generation enhancements.

[icing]

Adding authorityInfoAccess to generated certs and generating stunnel.pem as well.

Updated pinned key sha256// base64 in test2041.

[bagder]

Test 2087 seems to need an update too due to the updated cert:

 14:36:06.283112 == Info:  public key hash: sha256//d6NWnt6Q9+jU//Ak49bc7+k96pcarb3XjHYM8BMPxg0=

[icing]

Updated the sha256 for that schannel test.

[bagder]

Thanks!