Add sftp strict host key checking to DFC tests

Issue-ID: DCAEGEN2-2219
Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>
Change-Id: I77438c7215bc80c65080f7c773fb9401edef6e79
diff --git a/scripts/dcaegen2-collectors-datafile/dfc-management/docker-compose.yml b/scripts/dcaegen2-collectors-datafile/dfc-management/docker-compose.yml
index 02e0eb6..f92d19f 100644
--- a/scripts/dcaegen2-collectors-datafile/dfc-management/docker-compose.yml
+++ b/scripts/dcaegen2-collectors-datafile/dfc-management/docker-compose.yml
@@ -22,3 +22,4 @@
       CONSUL_PORT: 8500
       CONFIG_BINDING_SERVICE: "config-binding-service"
       HOSTNAME: "dfc_app0"
+      KNOWN_HOSTS_FILE_PATH: "/home/datafile/.ssh/known_hosts"