MGMT-13946: Ignore Proliant Gen 11 serial (openshift#522)

We have seen different hosts with the same motherboard serial on this
type of hardware, so we should ignore it and fallback to other methods
of generating the host UUID.

src/scanners/machine_uuid_scanner.go

@@ -23,6 +23,7 @@ const (
 	SerialUnspecifiedBaseBoardString = "unspecified base board serial number" // BF cards
 	SerialUnspecifiedSystemString    = "unspecified system serial number"     // BF cards
 	SerialNotSpecified               = "not specified"                        // Linode
+	SerialProliantGen11              = "PCA_number.ACC"                       // Proliant Gen 11
 	ZeroesUUID                       = "00000000-0000-0000-0000-000000000000"
 	KaloomUUID                       = "03000200-0400-0500-0006-000700080009" // All hosts of this type have the same UUID
 )
@@ -33,7 +34,7 @@ var (
 
 var unknownSerialCases = []string{"", util.UNKNOWN, "none",
 	SerialUnspecifiedBaseBoardString, SerialUnspecifiedSystemString,
-	SerialDefaultString, SerialNotSpecified}
+	SerialDefaultString, SerialNotSpecified, strings.ToLower(SerialProliantGen11)}
 var unknownUuidCases = []string{"", util.UNKNOWN, ZeroesUUID, KaloomUUID}
 
 func disableGHWWarnings() {

src/scanners/machine_uuid_scanner_test.go

@@ -72,6 +72,7 @@ var _ = Describe("Machine uuid test", func() {
 		uuid     string
 	}{
 		{useCase: "kaloom", mbSerial: SerialDefaultString, uuid: KaloomUUID},
+		{useCase: "proliantgen11", mbSerial: SerialProliantGen11, uuid: ZeroesUUID},
 		{useCase: "zeroes", mbSerial: SerialDefaultString, uuid: ZeroesUUID},
 		{useCase: "linode", mbSerial: SerialNotSpecified, uuid: "Not Settable"},
 	}