* [azure-security-keyvault-common-cpp] Update to 4.0.0-beta.1
## 4.0.0-beta.1 (2021-04-07)
### New Features
- KeyVaultException.
* [azure-security-keyvault-keys-cpp] Update to 4.0.0-beta.1
## 4.0.0-beta.1 (2021-04-07)
### New Features
- Added `Azure::Security::KeyVault::Keys::KeyClient` for get, create, list, delete, backup, restore, and import key operations.
- Added high-level and simplified `key_vault.hpp` file for simpler include experience for customers.
- Added model types which are returned from the `KeyClient` operations, such as `Azure::Security::KeyVault::Keys::KeyVaultKey`.
* Update vcpkg ports to use a manifest json file instead of a CONTROL
file.
* Update git tree sha versions using the command 'x-add-version --all
--overwrite-version'
Co-authored-by: Ahson Khan <ahkha@microsoft.com>
