Save the private keys used by generated verify_certificate_chain tests.

net/data/verify_certificate_chain_unittest/README

Index: net/data/verify_certificate_chain_unittest/README
diff --git a/net/data/verify_certificate_chain_unittest/README b/net/data/verify_certificate_chain_unittest/README
index a529a508eff9a2cf9216160a1c32e3b7e0b1536a..9cb1281efa3ab8653ffa6d0ab0c46fa50373caa9 100644
--- a/net/data/verify_certificate_chain_unittest/README
+++ b/net/data/verify_certificate_chain_unittest/README
@@ -17,6 +17,15 @@ generate-all.sh
 Runs all of the generate-*.py scripts and does some cleanup.
 
 ===============================
+keys/XXX/*.key
+===============================
+
+The keys used/generated by test XXX. The privat keys shouldn't be needed to run

[mattm, 2017/04/10 23:13:00]

private

[eroman, 2017/04/10 23:56:30]

Done.

+the tests, however are useful when re-generating the test data to have stable
+results (at least for signature types which are deterministic, like RSASSA
+PKCS#1 which is used by most of the certificates data)
+
+===============================
 *.pem
 ===============================