Add host key verification skip system property

src/main/kotlin/us/ihmc/cd/RemoteExtension.kt

@@ -6,6 +6,7 @@ import net.schmizz.sshj.connection.channel.direct.Session
 import net.schmizz.sshj.sftp.SFTPClient
 import net.schmizz.sshj.transport.verification.OpenSSHKnownHosts
 import net.schmizz.sshj.transport.verification.PromiscuousVerifier
+import org.apache.commons.exec.OS
 import org.gradle.api.Action
 import us.ihmc.build.LogTools
 import java.io.IOException
@@ -99,17 +100,22 @@ open class RemoteExtension
    {
       val sshClient = SSHClient()
 
-      val sshDir = OpenSSHKnownHosts.detectSSHDir()
-
-      if (sshDir.resolve("known_hosts").isFile)
+      try
       {
          sshClient.loadKnownHosts()
       }
-      else
+      catch (e: Exception)
       {
-         LogTools.warn("Could not find known_hosts file. Disabling host key verification.")
-
-         sshClient.addHostKeyVerifier(PromiscuousVerifier())
+         if (System.getProperty("ignoreHostIdentity", "false").equals("true"))
+         {
+            LogTools.warn("Could not find known_hosts file. Disabling host key verification (using -PignoreHostIdentity=true).")
+            sshClient.addHostKeyVerifier(PromiscuousVerifier())
+         }
+         else
+         {
+            LogTools.warn("Could not find known_hosts file. Disable host key verification with -PignoreHostIdentity=true. Please understand the security implications of doing this!")
+            throw e
+         }
       }
 
       sshClient.connect(address)