RFC 7616: fixed failing testcases in pipelines

Author: pratt4

client/src/main/java/org/asynchttpclient/Realm.java

@@ -272,7 +272,7 @@ public static class Builder {
         private String methodName = GET;
         private boolean usePreemptive;
         private String ntlmDomain = System.getProperty("http.auth.ntlm.domain");
-        private static Charset charset = UTF_8;
+        private Charset charset = UTF_8;
         private String ntlmHost = "localhost";
         private boolean useAbsoluteURI;
         private boolean omitQuery;