Clean up system image release psq poller

Include:
1. change all %d placeholder to %s since these vars acould be None
intially.
2. remove local debugging print.

Change-Id: Ibecf16820cd76d78723c328df5a1f6e2ec9e99cf
1 file changed
tree: ddedffe8baf352d0f94ddb5e81c7a163b0bd8f52
  1. build/
  2. console_test_server/
  3. emu_test/
  4. system_image_uitests/