Refactor matrixfederationclient to fix logging (#3906)

We want to wait until we have read the response body before we log the request
as complete, otherwise a confusing thing happens where the request appears to
have completed, but we later fail it.

To do this, we factor the salient details of a request out to a separate
object, which can then keep track of the txn_id, so that it can be logged.

1 files changed, 1 insertions, 0 deletions

diff --git a/changelog.d/3906.misc b/changelog.d/3906.misc
new file mode 100644
index 0000000000..11709186d3
--- /dev/null
+++ b/changelog.d/3906.misc
@@ -0,0 +1 @@
+Improve logging of outbound federation requests
\ No newline at end of file