Switch from pkg/secrets to pkg/subscriptions

The buildah/pkg/secrts package was move to
containers/common/pkg/subscriptions.
Switch to using this by default.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/containers/common/pkg/umask/umask_unix.go

@@ -0,0 +1,20 @@
+// +build linux darwin
+
+package umask
+
+import (
+	"syscall"
+
+	"github.com/sirupsen/logrus"
+)
+
+func Check() {
+	oldUmask := syscall.Umask(0022) //nolint
+	if (oldUmask & ^0022) != 0 {
+		logrus.Debugf("umask value too restrictive.  Forcing it to 022")
+	}
+}
+
+func Set(value int) int {
+	return syscall.Umask(value)
+}

vendor/github.com/containers/common/pkg/umask/umask_unsupported.go

@@ -0,0 +1,7 @@
+// +build !linux,!darwin
+
+package umask
+
+func Check() {}
+
+func Set(int) int { return 0 }