SDNC project uses netconfsimulator in csit tests.

Testcases are failing due to certificate issue, because server_cert is not longer valid.

pnf-simulator/netconfsimulator/tls$ openssl x509 -in server_cert.crt -text -noout
Certificate:
    Data:
        Version: 1 (0x0)
        Serial Number: 100 (0x64)
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: C = PL, ST = DS, L = Wroclaw, O = Nokia, OU = Mano, CN = Onap
        Validity
            Not Before: Nov  6 15:13:22 2019 GMT
            Not After : Nov  5 15:13:22 2023 GMT  <-----
        Subject: C = PL, ST = DN, L = Wroclaw, O = Nokia, OU = Mano, CN = Onap
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption