Set Type of Client Certificate verification and Maximum depth of CA
Certificates in Client Certificate verification.
This is used to change the verification level for a connection prior to
starting a re-negotiation.
The following levels are available for level:
SSL_CVERIFY_NONE - No client Certificate is required at all
SSL_CVERIFY_OPTIONAL - The client may present a valid Certificate
SSL_CVERIFY_REQUIRE - The client has to present a valid
SSL_CVERIFY_OPTIONAL_NO_CA - The client may present a valid Certificate
but it need not to be (successfully)
sock The socket to change.
level Type of Client Certificate verification.