[VOL-1866] Changed module dependency to v12.0.0 of k8s client-go and v1.15.4 of k8s api/apimachinery in sync with other voltha components

Had to use pseudo-version corresponding to v12.0.0 of k8s client-go
because golang proxy is no longer serving the modules not complying
to Semantic Import Versioning rules including client-go v12.0.0.
Refer to https://github.com/kubernetes/client-go/issues/631 and
https://github.com/golang/go/issues/33558

Change-Id: I2e558bab7f0702f230761319eb5392a7d0532ea3
diff --git a/vendor/k8s.io/api/scheduling/v1alpha1/generated.pb.go b/vendor/k8s.io/api/scheduling/v1alpha1/generated.pb.go
index 0a0d481..3fedb7d 100644
--- a/vendor/k8s.io/api/scheduling/v1alpha1/generated.pb.go
+++ b/vendor/k8s.io/api/scheduling/v1alpha1/generated.pb.go
@@ -33,6 +33,8 @@
 import fmt "fmt"
 import math "math"
 
+import k8s_io_api_core_v1 "k8s.io/api/core/v1"
+
 import strings "strings"
 import reflect "reflect"
 
@@ -99,6 +101,12 @@
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(len(m.Description)))
 	i += copy(dAtA[i:], m.Description)
+	if m.PreemptionPolicy != nil {
+		dAtA[i] = 0x2a
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(len(*m.PreemptionPolicy)))
+		i += copy(dAtA[i:], *m.PreemptionPolicy)
+	}
 	return i, nil
 }
 
@@ -158,6 +166,10 @@
 	n += 2
 	l = len(m.Description)
 	n += 1 + l + sovGenerated(uint64(l))
+	if m.PreemptionPolicy != nil {
+		l = len(*m.PreemptionPolicy)
+		n += 1 + l + sovGenerated(uint64(l))
+	}
 	return n
 }
 
@@ -197,6 +209,7 @@
 		`Value:` + fmt.Sprintf("%v", this.Value) + `,`,
 		`GlobalDefault:` + fmt.Sprintf("%v", this.GlobalDefault) + `,`,
 		`Description:` + fmt.Sprintf("%v", this.Description) + `,`,
+		`PreemptionPolicy:` + valueToStringGenerated(this.PreemptionPolicy) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -347,6 +360,36 @@
 			}
 			m.Description = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 5:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field PreemptionPolicy", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			s := k8s_io_api_core_v1.PreemptionPolicy(dAtA[iNdEx:postIndex])
+			m.PreemptionPolicy = &s
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGenerated(dAtA[iNdEx:])
@@ -589,33 +632,36 @@
 }
 
 var fileDescriptorGenerated = []byte{
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