[VOL-3386] Add support for secure gRPC in openolt-agent
The init script of the openolt service may start with '--enable-tls <TLS_OPTION>' argument for the gRPC server.
Default is insecure with no '--enable-tls' argument.
The TLS capability depends upon the certificates stored at the keystore/ directory: 1. root.crt (CA public key), 2. server.crt (public key), 3.server.key (private key).
Four unit tests are added for the secure gRPC server which work with the keystore-test/ directory.
The certificates stored at the keystore-test/ directory are self-signed certificates, valid until Apr 11 23:16:58 2031 GMT.
Change-Id: I4d18a98a0193f501f922360c79f54b0fcedf14a5
diff --git a/.gitignore b/.gitignore
index 2ebaf57..f510ac4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,3 +36,6 @@
# vscode
.vscode
+
+# for unit tests
+keystore/