Broken UTs

[juagargi]

Some of the unit tests (make test) are now broken, possibly due to expired cryptographic material from testdata.
Four packages are being reported:

• go/pkg/ca/renewal:go_default_test
• go/pkg/cs/drkey/grpc:go_default_test
• go/pkg/cs/trust:go_default_test
• go/pkg/trust:go_default_test

The output of the failures is similar to this partial one, from go/pkg/trust :

--- FAIL: TestTLSCryptoManagerVerifyServerCertificate (0.00s)
    --- FAIL: TestTLSCryptoManagerVerifyServerCertificate/valid (0.00s)
        tls_handshake_test.go:63: 
                Error Trace:    tls_handshake_test.go:63
                Error:          Received unexpected error:
                                verifying chains: [ chain did not verify against any selected TRC {errors=[verifying chain {trc_base=1; trc_serial=1}: x509: certificate has expired or is not yet valid: current time 2022-07-01T07:41:07Z is after 2022-05-14T11:11:02Z]} ]
                Test:           TestTLSCryptoManagerVerifyServerCertificate/valid

[JordiSubira]

Indeed, this also relates to #98 that has been open for a while.