Pass config directory to JvmOptionsParser (#368)

Relates: elastic/elasticsearch#51882

With the introduction of jvm.options.d directory for customizing
jvm.options, the config directory path is now passed to jvm.options
parser tool instead of the jvm.options path. See the elasticsearch.bat
change for comparison:

https://github.com/elastic/elasticsearch/pull/51882/files#diff-6c06e8a0d0742dc053b8afcbfb2b4201R76

Fixes #363

src/ProcessHosts/Elastic.ProcessHosts/Elasticsearch/Process/ElasticsearchProcess.cs

@@ -124,10 +124,9 @@ protected sealed override IEnumerable<string> CreateObservableProcessArguments(I
 
 			if (!this.JavaVersionChecker.Start(null, out var javaVersionOut))
 				throw new StartupException($"Invalid Java version reported: {javaVersionOut}");
-
-			var jvmOptionsFile = Path.Combine(this.ConfigDirectory, "jvm.options");
-			if (!this.JvmOptionsParser.Start(new [] { $"\"{jvmOptionsFile}\"" }, out var jvmOptionsLine) || string.IsNullOrWhiteSpace(jvmOptionsLine)) 
-				throw new StartupException($"Could not evaluate jvm.options file: {jvmOptionsFile} result: {jvmOptionsLine}");
+
+			if (!this.JvmOptionsParser.Start(new [] { $"\"{this.ConfigDirectory}\"" }, out var jvmOptionsLine) || string.IsNullOrWhiteSpace(jvmOptionsLine)) 
+				throw new StartupException($"Could not evaluate jvm.options file. result: {jvmOptionsLine}");
 			jvmOptionsLine = jvmOptionsLine.Replace("${ES_TMPDIR}", this.PrivateTempDirectory).Replace("\n", "").Replace("\r", "");
 
 			return new []