Leave all the security configurations blank in nifi.properties by def…

…ault.

Nifi 1.12.1 checks whether any of these `nifi.security.XXX` values is non-empty to determine whether the user wants to set a keystore or not.

We leave them blank by default so unsecured clusters will at least run.

Fixes the "TlsException: The keystore properties are not valid" error when starting up.

Fixes cetic#77

configs/nifi.properties

@@ -151,11 +151,11 @@ nifi.sensitive.props.provider=BC
 nifi.sensitive.props.additional.keys=
 
 nifi.security.keystore=
-nifi.security.keystoreType=jks
+nifi.security.keystoreType=
 nifi.security.keystorePasswd=
 nifi.security.keyPasswd=
 nifi.security.truststore=
-nifi.security.truststoreType=jks
+nifi.security.truststoreType=
 nifi.security.truststorePasswd=
 nifi.security.needClientAuth={{.Values.properties.needClientAuth}}
 nifi.security.user.authorizer={{.Values.properties.authorizer}}