fix issue with not properly finishing the gzip stream

Author: BrandonArp

src/main/java/com/arpnetworking/tsdcore/sinks/HttpPostSink.java

@@ -115,6 +115,7 @@ protected RequestInfo createRequest(final AsyncHttpClient client, final byte[] s
                  GZIPOutputStream gzipStream = new GZIPOutputStream(bos)) {
 
                 gzipStream.write(serializedData);
+                gzipStream.finish();
                 gzipStream.flush();
                 bodyData = bos.toByteArray();
             } catch (final IOException e) {

src/main/java/com/arpnetworking/tsdcore/sinks/KairosDbSink.java

@@ -168,6 +168,7 @@ protected RequestInfo createRequest(final AsyncHttpClient client, final byte[] s
                  GZIPOutputStream gzipStream = new GZIPOutputStream(bos)) {
 
                 gzipStream.write(serializedData);
+                gzipStream.finish();
                 gzipStream.flush();
                 bodyData = bos.toByteArray();
             } catch (final IOException e) {