Add region mapping config for PowerVS cloud

This is to keep the region mapping of PowerVS in common package

pkg/config/cloud/powervs/powervs_regions.go

@@ -0,0 +1,107 @@
+package powervs
+
+import (
+	"fmt"
+)
+
+// Since there is no API to query these, we have to hard-code them here.
+
+// Region describes resources associated with a region in Power VS.
+// We're using a few items from the IBM Cloud VPC offering. The region names
+// for VPC are different so another function of this is to correlate those.
+type Region struct {
+	Description string
+	VPCRegion   string
+	Zones       []string
+}
+
+// Regions holds the regions for IBM Power VS, and descriptions used during the survey.
+var Regions = map[string]Region{
+	"dal": {
+		Description: "Dallas, USA",
+		VPCRegion:   "us-south",
+		Zones:       []string{"dal12"},
+	},
+	"eu-de": {
+		Description: "Frankfurt, Germany",
+		VPCRegion:   "eu-de",
+		Zones: []string{
+			"eu-de-1",
+			"eu-de-2",
+		},
+	},
+	"lon": {
+		Description: "London, UK.",
+		VPCRegion:   "eu-gb",
+		Zones: []string{
+			"lon04",
+			"lon06",
+		},
+	},
+	"mon": {
+		Description: "Montreal, Canada",
+		VPCRegion:   "ca-tor",
+		Zones:       []string{"mon01"},
+	},
+	"osa": {
+		Description: "Osaka, Japan",
+		VPCRegion:   "jp-osa",
+		Zones:       []string{"osa21"},
+	},
+	"syd": {
+		Description: "Sydney, Australia",
+		VPCRegion:   "au-syd",
+		Zones: []string{
+			"syd04",
+			"syd05",
+		},
+	},
+	"sao": {
+		Description: "São Paulo, Brazil",
+		VPCRegion:   "br-sao",
+		Zones:       []string{"sao01"},
+	},
+	"tor": {
+		Description: "Toronto, Canada",
+		VPCRegion:   "ca-tor",
+		Zones:       []string{"tor01"},
+	},
+	"tok": {
+		Description: "Tokyo, Japan",
+		VPCRegion:   "jp-tok",
+		Zones:       []string{"tok04"},
+	},
+	"us-east": {
+		Description: "Washington DC, USA",
+		VPCRegion:   "us-east",
+		Zones:       []string{"us-east"},
+	},
+}
+
+// VPCRegionForPowerVSRegion returns the VPC region for the specified PowerVS region.
+func VPCRegionForPowerVSRegion(region string) (string, error) {
+	if r, ok := Regions[region]; ok {
+		return r.VPCRegion, nil
+	}
+
+	return "", fmt.Errorf("VPC region corresponding to a PowerVS region %s not found ", region)
+}
+
+// RegionShortNames returns the list of region names
+func RegionShortNames() []string {
+	keys := []string{}
+	for r := range Regions {
+		keys = append(keys, r)
+	}
+	return keys
+}
+
+// ValidateVPCRegion validates that given VPC region is known/tested.
+func ValidateVPCRegion(region string) bool {
+	for r := range Regions {
+		if region == Regions[r].VPCRegion {
+			return true
+		}
+	}
+	return false
+}