Unit tests involving certificate error strings fail on Go Version 1.17.1

[dechdev]

When running make test with Go Version 1.17.1, I get the following unit test failures. Github Actions uses version 1.16.9 and not 1.17.1, so the newer version of Go could be the possible culprit.

--- FAIL: TestClient (0.00s)
    certs_test.go:83:
        	Error Trace:	certs_test.go:83
        	Error:      	Error message not equal:
        	            	expected: "asn1: syntax error: data truncated"
        	            	actual  : "x509: malformed certificate"
        	Test:       	TestClient
--- FAIL: TestResolveSignerBadECertReturned (0.00s)
    fabric_test.go:516:
        	Error Trace:	fabric_test.go:516
        	Error:      	Error message not equal:
        	            	expected: "FF10286: Failed to decode certificate: asn1: syntax error: data truncated"
        	            	actual  : "FF10286: Failed to decode certificate: x509: malformed certificate"
        	Test:       	TestResolveSignerBadECertReturned
--- FAIL: TestResolveSignerBadCACertReturned (0.00s)
    fabric_test.go:534:
        	Error Trace:	fabric_test.go:534
        	Error:      	Error message not equal:
        	            	expected: "FF10286: Failed to decode certificate: asn1: syntax error: data truncated"
        	            	actual  : "FF10286: Failed to decode certificate: x509: malformed certificate"
        	Test:       	TestResolveSignerBadCACertReturned

[nguyer]

This is fixed in #242

[nguyer]

Re-opening this, because only the tests in fabric_test.go got fixed in the PR mentioned above

[dechdev]

Fixed in #303