Format python files.

I used yapf to apply to Google style but I had to install with pip and
invoke the library as a script so not suitable for integration yet.

Change-Id: I8c3d9c334bf1766f0fff7217270c148a3d1d7662
diff --git a/build/image/generate_initrd.py b/build/image/generate_initrd.py
index 488745f..28e1680 100644
--- a/build/image/generate_initrd.py
+++ b/build/image/generate_initrd.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-
 """Generate an initial RAM disk for the hypervisor.
 
 Packages the VMs, initrds for the VMs and the list of secondary VMs (vms.txt)
@@ -12,44 +11,50 @@
 import subprocess
 import sys
 
+
 def Main():
-  parser = argparse.ArgumentParser()
-  parser.add_argument("--primary_vm", required=True)
-  parser.add_argument("--primary_vm_initrd")
-  parser.add_argument("--secondary_vm", action="append", nargs=4, metavar=("MEMORY", "CORES", "NAME", "IMAGE"))
-  parser.add_argument("--staging", required=True)
-  parser.add_argument("--output", required=True)
-  args = parser.parse_args()
-  # Prepare the primary VM image.
-  staged_files = ["vmlinuz"]
-  shutil.copyfile(args.primary_vm, os.path.join(args.staging, "vmlinuz"))
-  # Prepare the primary VM's initrd. Currently, it just makes an empty one.
-  if args.primary_vm_initrd:
-    raise NotImplementedError("This doesn't copy the primary VM's initrd yet")
-  with open(os.path.join(args.staging, "initrd.img"), "w") as vms_txt:
-    staged_files.append("initrd.img")
-  # Prepare the secondary VMs.
-  with open(os.path.join(args.staging, "vms.txt"), "w") as vms_txt:
-    staged_files.append("vms.txt")
-    if args.secondary_vm:
-      for vm in args.secondary_vm:
-        (vm_memory, vm_cores, vm_name, vm_image) = vm
-        staged_files.append(vm_name)
-        shutil.copy(vm_image, os.path.join(args.staging, vm_name))
-        vms_txt.write("{} {} {}\n".format(vm_memory, vm_cores, vm_name))
-  # Package files into an initial RAM disk.
-  with open(args.output, "w") as initrd:
-    # Move into the staging directory so the file names taken by cpio don't
-    # include the path.
-    os.chdir(args.staging)
-    cpio = subprocess.Popen([
-        "cpio",
-        "--create"],
-        stdin=subprocess.PIPE,
-        stdout=initrd,
-        stderr=subprocess.PIPE)
-    cpio.communicate(input="\n".join(staged_files).encode("utf-8"))
-  return 0
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--primary_vm", required=True)
+    parser.add_argument("--primary_vm_initrd")
+    parser.add_argument(
+        "--secondary_vm",
+        action="append",
+        nargs=4,
+        metavar=("MEMORY", "CORES", "NAME", "IMAGE"))
+    parser.add_argument("--staging", required=True)
+    parser.add_argument("--output", required=True)
+    args = parser.parse_args()
+    # Prepare the primary VM image.
+    staged_files = ["vmlinuz"]
+    shutil.copyfile(args.primary_vm, os.path.join(args.staging, "vmlinuz"))
+    # Prepare the primary VM's initrd. Currently, it just makes an empty one.
+    if args.primary_vm_initrd:
+        raise NotImplementedError(
+            "This doesn't copy the primary VM's initrd yet")
+    with open(os.path.join(args.staging, "initrd.img"), "w") as vms_txt:
+        staged_files.append("initrd.img")
+    # Prepare the secondary VMs.
+    with open(os.path.join(args.staging, "vms.txt"), "w") as vms_txt:
+        staged_files.append("vms.txt")
+        if args.secondary_vm:
+            for vm in args.secondary_vm:
+                (vm_memory, vm_cores, vm_name, vm_image) = vm
+                staged_files.append(vm_name)
+                shutil.copy(vm_image, os.path.join(args.staging, vm_name))
+                vms_txt.write("{} {} {}\n".format(vm_memory, vm_cores, vm_name))
+    # Package files into an initial RAM disk.
+    with open(args.output, "w") as initrd:
+        # Move into the staging directory so the file names taken by cpio don't
+        # include the path.
+        os.chdir(args.staging)
+        cpio = subprocess.Popen(
+            ["cpio", "--create"],
+            stdin=subprocess.PIPE,
+            stdout=initrd,
+            stderr=subprocess.PIPE)
+        cpio.communicate(input="\n".join(staged_files).encode("utf-8"))
+    return 0
+
 
 if __name__ == "__main__":
-  sys.exit(Main())
+    sys.exit(Main())