releasetools: Use pattern filter when unzipping.

When building BBOTAs, it only needs *some* unzipped entries in the given
target_files zip(s). In particular, it needs 'IMAGES/*', 'META/*',
'RADIO/*'. (It also reads 'SYSTEM/build.prop' and 'OTA/bin/updater', but
directly from the zip file.)

This CL specifies the entries to unzip. It saves the I/O cost, as well as
the temporary storage.

Test: ota_from_target_files.py gives the same package w/ and w/o the CL.
Test: check_target_files_signatures.py still works.
Change-Id: I728428aa0e138879e49f9efbdb46a85892fc7038

tools/releasetools/common.py

@@ -564,7 +564,7 @@ def UnzipTemp(filename, pattern=None):
   def unzip_to_dir(filename, dirname):
     cmd = ["unzip", "-o", "-q", filename, "-d", dirname]
     if pattern is not None:
-      cmd.append(pattern)
+      cmd.extend(pattern)
     p = Run(cmd, stdout=subprocess.PIPE)
     p.communicate()
     if p.returncode != 0: