Vendor in latest Buildah

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

vendor/github.com/containers/buildah/buildah.go

@@ -26,7 +26,7 @@ const (
 	Package = "buildah"
 	// Version for the Package.  Bump version in contrib/rpm/buildah.spec
 	// too.
-	Version = "1.7.2"
+	Version = "1.8-dev"
 	// The value we use to identify what type of information, currently a
 	// serialized Builder structure, we are using as per-container state.
 	// This should only be changed when we make incompatible changes to
@@ -284,6 +284,12 @@ type CommonBuildOptions struct {
 	CPUSetMems string
 	// Memory is the upper limit (in bytes) on how much memory running containers can use.
 	Memory int64
+	// DNSSearch is the list of DNS search domains to add to the build container's /etc/resolv.conf
+	DNSSearch []string
+	// DNSServers is the list of DNS servers to add to the build container's /etc/resolv.conf
+	DNSServers []string
+	// DNSOptions is the list of DNS
+	DNSOptions []string
 	// MemorySwap limits the amount of memory and swap together.
 	MemorySwap int64
 	// LabelOpts is the a slice of fields of an SELinux context, given in "field:pair" format, or "disable".