test: Don't encrypt/move the EFI partition in encrypt_root

Doing that messes up the kernel's mount state, and eventually mounts the
new /boot *on top of* the old /boot and /boot/efi. This results in
/boot/efi not being umountable any more, and hanging forever during
shutdown on waiting for boot-efi.mount to finish stopping.

test/common/storagelib.py

@@ -607,6 +607,8 @@ def encrypt_root(self, passphrase):
 mkdir /new-root
 mount /dev/root/root /new-root
 mkfs.ext4 {dev}1
+# don't move the EFI partition
+if mountpoint /boot/efi; then umount /boot/efi; fi
 mkdir /new-root/boot
 mount {dev}1 /new-root/boot
 tar --selinux --one-file-system -cf - --exclude /boot --exclude='/var/tmp/*' --exclude='/var/cache/*' \