Specifies the certificate storage where server certificates are stored.
This property defines the storage where TElWebDAVServer takes the certificates
to send to clients. As different ciphersuites require different types of certificates,
it may be impossible to use some ciphersuites due to the absence of a certificate of the required type in the storage.
If there are no certificates in the CertStorage, it is impossible to use any ciphersuites except DH_ANON_X_Y ones.
Note, that certificates in the CertStorage must have corresponding private keys. It is possible to put several certificates, which create a certificate chain, without private keys, but the ending certificate of the chain must have the private key anyway.