releasetools: Add PayloadSigner class.
Create a wrapper class that handles the payload signing, which unifies
the paths with and without external signer. Also add tests for the newly
added class.
The test keys under testdata/ are created with the script in
development/tools/make_key. testdata/testkey_with_passwd.pk8 uses
password "foo".
Test: python -m unittest test_ota_from_target_files
Test: Get identical A/B OTA packages w/ and w/o the CL.
Change-Id: Ic770aec726498a3babb88ec509985e7f1210fb18
diff --git a/tools/releasetools/testdata/testkey.x509.pem b/tools/releasetools/testdata/testkey.x509.pem
new file mode 100644
index 0000000..65c8085
--- /dev/null
+++ b/tools/releasetools/testdata/testkey.x509.pem
@@ -0,0 +1,24 @@
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