Install android test certificate authority when host supports SNI

tools/telemetry/telemetry/unittest_util/system_stub.py

Index: tools/telemetry/telemetry/unittest_util/system_stub.py
diff --git a/tools/telemetry/telemetry/unittest_util/system_stub.py b/tools/telemetry/telemetry/unittest_util/system_stub.py
index 1794e525370ca76fb47dded64925fb8108a60e56..31f71f81d67d8218110062a3d3c54bbb78118757 100644
--- a/tools/telemetry/telemetry/unittest_util/system_stub.py
+++ b/tools/telemetry/telemetry/unittest_util/system_stub.py
@@ -490,6 +490,10 @@ class CertUtilsStub(object):
   def generate_dummy_ca_cert():
     return '-', '-'
 
+  @staticmethod
+  def has_sni():
+    return True
+
 class AdbInstallCertStub(object):
   class AndroidCertInstaller(object):
     def __init__(self, device_id, _cert_name, _cert_path):