Refactor how net/data/verify_certificate_chain_unittest/*

net/data/verify_certificate_chain_unittest/serverauth-rsa-ku-digitalsignature/generate-chains.py

Index: net/data/verify_certificate_chain_unittest/serverauth-rsa-ku-digitalsignature/generate-chains.py
diff --git a/net/data/verify_certificate_chain_unittest/generate-serverauth-rsa-ku-digitalsignature.py b/net/data/verify_certificate_chain_unittest/serverauth-rsa-ku-digitalsignature/generate-chains.py
similarity index 74%
rename from net/data/verify_certificate_chain_unittest/generate-serverauth-rsa-ku-digitalsignature.py
rename to net/data/verify_certificate_chain_unittest/serverauth-rsa-ku-digitalsignature/generate-chains.py
index 354b9b2a79ca89d25c2c73b964d9112b87a58e7b..7a45e97c58e8e0cf769e1d5de3401ac37d83031d 100755
--- a/net/data/verify_certificate_chain_unittest/generate-serverauth-rsa-ku-digitalsignature.py
+++ b/net/data/verify_certificate_chain_unittest/serverauth-rsa-ku-digitalsignature/generate-chains.py
@@ -6,6 +6,9 @@
 """Certificate chain with 1 intermediate, a trusted root, and a target
 certificate for serverAuth that has only digitalSignature."""
 
+import sys
+sys.path += ['..']
+
 import common
 
 # Self-signed root certificate (used as trust anchor).
@@ -21,13 +24,5 @@ target.set_key(common.get_or_generate_rsa_key(
 target.get_extensions().set_property('extendedKeyUsage', 'serverAuth')
 target.get_extensions().set_property('keyUsage', 'critical,digitalSignature')
 
-
-chain = [target, intermediate]
-trusted = common.TrustAnchor(root, constrained=False)
-time = common.DEFAULT_TIME
-key_purpose = common.KEY_PURPOSE_SERVER_AUTH
-verify_result = True
-errors = None
-
-common.write_test_file(__doc__, chain, trusted, time, key_purpose,
-                       verify_result, errors)
+chain = [target, intermediate, root]
+common.write_chain(__doc__, chain, 'chain.pem')