Added case for lowercase protocol (kedgeproject#564)

This will accept if someone specifies protocol as
tcp or Tcp or tCp. Likewise UDP also
Always return the protocol as Uppercase
Added test for two cases

changed variable name to CamelCase

pkg/spec/resources.go

@@ -669,9 +669,10 @@ func parsePortMapping(pm string) (*api_v1.ServicePort, error) {
 	// Case 3 - port/protocol
 	// Case 4 - port:targetPort/protocol
 	case 2:
-		switch api_v1.Protocol(protocolSplit[1]) {
+		protocolUpperCase := strings.ToUpper(protocolSplit[1])
+		switch api_v1.Protocol(protocolUpperCase) {
 		case api_v1.ProtocolTCP, api_v1.ProtocolUDP:
-			protocol = api_v1.Protocol(protocolSplit[1])
+			protocol = api_v1.Protocol(protocolUpperCase)
 		default:
 			return nil, fmt.Errorf("invalid protocol '%v' provided, the acceptable values are '%v' and '%v'", protocolSplit[1], api.ProtocolTCP, api.ProtocolUDP)
 		}

pkg/spec/resources_test.go

@@ -1017,6 +1017,30 @@ func TestParsePortMapping(t *testing.T) {
 			},
 			success: true,
 		},
+		{
+			name:        "port/protocol(lowercase) is passed",
+			portMapping: "1337/udp",
+			servicePort: &api_v1.ServicePort{
+				Port: 1337,
+				TargetPort: intstr.IntOrString{
+					IntVal: 1337,
+				},
+				Protocol: api_v1.ProtocolUDP,
+			},
+			success: true,
+		},
+		{
+			name:        "port/protocol(tCp) is passed",
+			portMapping: "1337/tCp",
+			servicePort: &api_v1.ServicePort{
+				Port: 1337,
+				TargetPort: intstr.IntOrString{
+					IntVal: 1337,
+				},
+				Protocol: api_v1.ProtocolTCP,
+			},
+			success: true,
+		},
 		{
 			name:        "port:targetPort/protocol is passed",
 			portMapping: "1337:1338/UDP",