Refactor how net/data/verify_certificate_chain_unittest/*

net/data/verify_certificate_chain_unittest/serverauth-ec-ku-keyagreement/generate-chains.py

Index: net/data/verify_certificate_chain_unittest/serverauth-ec-ku-keyagreement/generate-chains.py
diff --git a/net/data/verify_certificate_chain_unittest/generate-serverauth-ec-ku-keyagreement.py b/net/data/verify_certificate_chain_unittest/serverauth-ec-ku-keyagreement/generate-chains.py
similarity index 74%
rename from net/data/verify_certificate_chain_unittest/generate-serverauth-ec-ku-keyagreement.py
rename to net/data/verify_certificate_chain_unittest/serverauth-ec-ku-keyagreement/generate-chains.py
index 25bf78ddfe8dc2d0e872ece80cc0f18edc507a9f..a6be7955948539a57fd314f9da139e285acc22b8 100755
--- a/net/data/verify_certificate_chain_unittest/generate-serverauth-ec-ku-keyagreement.py
+++ b/net/data/verify_certificate_chain_unittest/serverauth-ec-ku-keyagreement/generate-chains.py
@@ -6,6 +6,9 @@
 """Certificate chain with 1 intermediate, a trusted root, and a target
 certificate for serverAuth that has only keyAgreement."""
 
+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_ec_key(
 target.get_extensions().set_property('extendedKeyUsage', 'serverAuth')
 target.get_extensions().set_property('keyUsage', 'critical,keyAgreement')
 
-
-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')