releasetools: Make scripts pylint clean.

Clean up the following scripts.
  blockimgdiff.py
  common.py
  edify_generator.py
  img_from_target_files.py
  ota_from_target_files.py

Seems we don't have a way to force pylint-ing the scripts using
per-directory pylintrc files (and we don't have pylint tool in AOSP
repo), per
https://android.googlesource.com/platform/tools/repohooks/#todo_limitations.

Test: `m dist`
Test: pylint --rcfile=pylintrc <script.py>
Change-Id: Ia6fd1ddc86f4d84c68e500f225d4a89d0fea8ec7
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 26d4187..2f0bd37 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -833,7 +833,8 @@
                                      allow_shared_blocks)
   system_tgt.ResetFileMap()
   system_diff = common.BlockDifference("system", system_tgt, src=None)
-  system_diff.WriteScript(script, output_zip)
+  system_diff.WriteScript(script, output_zip,
+                          write_verify_script=OPTIONS.verify)
 
   boot_img = common.GetBootableImage(
       "boot.img", "boot.img", OPTIONS.input_tmp, "BOOT")
@@ -845,7 +846,8 @@
                                        allow_shared_blocks)
     vendor_tgt.ResetFileMap()
     vendor_diff = common.BlockDifference("vendor", vendor_tgt)
-    vendor_diff.WriteScript(script, output_zip)
+    vendor_diff.WriteScript(script, output_zip,
+                            write_verify_script=OPTIONS.verify)
 
   AddCompatibilityArchiveIfTrebleEnabled(input_zip, output_zip, target_info)
 
@@ -1565,10 +1567,12 @@
   device_specific.IncrementalOTA_InstallBegin()
 
   system_diff.WriteScript(script, output_zip,
-                          progress=0.8 if vendor_diff else 0.9)
+                          progress=0.8 if vendor_diff else 0.9,
+                          write_verify_script=OPTIONS.verify)
 
   if vendor_diff:
-    vendor_diff.WriteScript(script, output_zip, progress=0.1)
+    vendor_diff.WriteScript(script, output_zip, progress=0.1,
+                            write_verify_script=OPTIONS.verify)
 
   if OPTIONS.two_step:
     common.ZipWriteStr(output_zip, "boot.img", target_boot.data)