NCO-40: Use ResponseHeadersRead for AsStreaming

Motivation
----------
Make streaming queries use ResponseHeadersRead and blocking
queries use ResponseContentRead.

Modifications
-------------
- Switch HttpCompletionOptions for streaming/blocking
- Fixup unit tests

Author: jeffrymorris

src/Couchbase.Analytics/AnalyticsService.cs

@@ -64,8 +64,8 @@ private async Task<IQueryResult> ExecuteQueryAsync(StringContent content, HttpCl
 
         try
         {
-            var response = await httpClient.SendAsync(request,
-                    HttpCompletionOption.ResponseHeadersRead,
+            var response = await httpClient.SendAsync(request, 
+                    asStreaming ? HttpCompletionOption.ResponseHeadersRead : HttpCompletionOption.ResponseContentRead,
                     cancellationToken)
                 .ConfigureAwait(false);
 

tests/Couchbase.Analytics.FunctionalTests/Internal/AnalyticsServiceTests.cs

@@ -45,7 +45,7 @@ public async Task Test_Streaming_Query()
         var result = await _analytics2Fixture.Cluster.ExecuteQueryAsync(statement,
             new QueryOptions() { Timeout = TimeSpan.FromSeconds(10), AsStreaming = true});
 
-        await foreach (var row in result)
+        await foreach (var row in result.ConfigureAwait(false))
         {
             var value = row.ContentAs<JsonElement>();
             _outputHelper.WriteLine(value.ToString());
@@ -62,7 +62,7 @@ public async Task Test_Blocking_Query()
         var result = await _analytics2Fixture.Cluster.ExecuteQueryAsync(statement,
             new QueryOptions() { Timeout = TimeSpan.FromSeconds(10), AsStreaming = false});
 
-        await foreach (var row in result)
+        await foreach (var row in result.ConfigureAwait(false))
         {
             var value = row.ContentAs<JsonElement>();
             _outputHelper.WriteLine(value.ToString());