Added missing dependencies for pypi

• Added the missing dependency to pynacl.

Support for Service Generated CSR on VaaS

• Added support for generation of CSR directly on VaaS platform. Renew operation does not include this feature as of now.

SSH CA Public Key Data retrieval

• Added support for retrieving the public key data and principals of an SSH Certificate Authority on TPP.

Support for PKCS12 format and flexible validity periods

• Support for PKCS12 has been added to the response certificate. Calling certificate.as_pkcs12("password") shall return the certificate content as PKCS12.
• Support for flexible validity periods has been added. Setting a value to request.validity_hours =144 will create a certificate with the specified expiration time period. Additionally, an issuer can be defined for TPP with request.issuer_hint=IssuerHint.MICROSOFT (or any value available on the IssuerHint object)

Added ability to retrieve the private key for service generated CSR

Added parameter to specify whether the private key should be returned by the server

Support for Service Generated CSR on TPP

Added ability to enroll/renew certificates using service generated CSR

Fixes for Vaas compatibility.

• Removed 'keyReuse' attribute for policy specification creation on VaaS.
• Fixed an issue on the url validation that failed for urls containing upper cases.

Support for SSH Certificates

Added support for SSH certificates in Trust Protection Platform through the new methods:
request_ssh_cert() and retrieve_ssh_cert(). For usage examples check: https://github.com/Venafi/vcert-python/tree/master/examples/ssh_certificates

Timeout fixes

Added a default timeout for request operations in both TPP and VaaS

Certificate Policy Management fixes

• Policy Management token scope separated from Certificate Management scope. Certificate Management scope is now default.
• Fixed an issue where retrieving a policy from VaaS returned the domains values with appended regexes if the Policy was created using any of the vcert sdks. This issue does not happen if the policy was created using VaaS UI.
• Fixed an issue where the Country regexes where being returned as the CN regexes when retrieving a Policy from VaaS.
• Fixed an issue where certificates requested from VaaS would fail to be retrieved even when the status of the Certificate is ISSUED. A timeout has been added to the request, so the sdk will try to retrieve the Certificate for that long before failing.