Redacted keystore and truststore passwords break YAML parsing

[rzvoncek]

The yaml files we feed to MC can have this:

server_encryption_options:
    internode_encryption: none
    keystore: /etc/cassandra/keystore.jks
    keystore_password: ****
    truststore: /etc/cassandra/truststore.jks
    truststore_password: ****

The **** literal is not a valid yaml and breaks the parsing:

Exception in thread "main" com.fasterxml.jackson.dataformat.yaml.snakeyaml.error.MarkedYAMLException: while scanning an alias
 in 'reader', line 924, column 24:
        keystore_password: ****
                           ^
unexpected character found *(42)
 in 'reader', line 924, column 25:
        keystore_password: ****
                            ^

 at [Source: (StringReader); line: 924, column: 22]
	at com.fasterxml.jackson.dataformat.yaml.snakeyaml.error.MarkedYAMLException.from(MarkedYAMLException.java:28)
	at com.fasterxml.jackson.dataformat.yaml.YAMLParser.nextToken(YAMLParser.java:407)
	at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.mapObject(UntypedObjectDeserializer.java:973)
	at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.deserialize(UntypedObjectDeserializer.java:718)
	at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.mapObject(UntypedObjectDeserializer.java:974)
	at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.deserialize(UntypedObjectDeserializer.java:718)
	at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.deserialize(UntypedObjectDeserializer.java:701)
	at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:322)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4674)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3629)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3597)
	at com.thelastpickle.montecristo.fileLoaders.parsers.application.CassandraYamlParser.parse(CassandraYamlParser.kt:16)
	at com.thelastpickle.montecristo.fileLoaders.parsers.application.CassandraYamlParser.parse(CassandraYamlParser.kt:11)
	at com.thelastpickle.montecristo.fileLoaders.Artifacts.createNode(Artifacts.kt:159)
	at com.thelastpickle.montecristo.fileLoaders.Artifacts.createCluster(Artifacts.kt:97)
	at com.thelastpickle.montecristo.commands.GenerateDiscoveryReport.execute(GenerateDiscoveryReport.kt:89)
	at com.thelastpickle.montecristo.commands.DiscoveryArgs.execute(DiscoveryArgs.kt:20)
	at com.thelastpickle.montecristo.MontecristoKt.main(Montecristo.kt:38)
Caused by: while scanning an alias
 in 'reader', line 924, column 24:
        keystore_password: ****
                           ^
unexpected character found *(42)
 in 'reader', line 924, column 25:
        keystore_password: ****
                            ^

	at org.yaml.snakeyaml.scanner.ScannerImpl.scanAnchor(ScannerImpl.java:1515)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchAlias(ScannerImpl.java:957)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:406)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:251)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingValue.produce(ParserImpl.java:660)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:166)
	at org.yaml.snakeyaml.parser.ParserImpl.getEvent(ParserImpl.java:176)
	at com.fasterxml.jackson.dataformat.yaml.YAMLParser.nextToken(YAMLParser.java:403)
	... 16 more

Montecristo should handle this by swallowing the exception and moving on.