MM-14574 Intercept log messages from local image proxy (#10668)

* MM-14574 Switch willnorris/imageproxy to fork

* MM-14574 Intercept log messages from local image proxy

* Revert "MM-14574 Switch willnorris/imageproxy to fork"

This reverts commit 046ab5c4216a5c6fee5bf8e2e0cceb1afffa6747.

* Update willnorris/imageproxy

go.sum

@@ -486,5 +486,5 @@ honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWh
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 willnorris.com/go/gifresize v1.0.0 h1:GKS68zjNhHMqkgNTv4iFAO/j/sNcVSOHQ7SqmDAIAmM=
 willnorris.com/go/gifresize v1.0.0/go.mod h1:eBM8gogBGCcaH603vxSpnfjwXIpq6nmnj/jauBDKtAk=
-willnorris.com/go/imageproxy v0.8.1-0.20190326225038-cf54b2cf2c9e h1:YPJb3vEWw4G0MHzd0k+CoO6p+2AS08dzXGLg40KB0P4=
-willnorris.com/go/imageproxy v0.8.1-0.20190326225038-cf54b2cf2c9e/go.mod h1:CKIesng3W4D4npJaypowqkxF33s3AH7EuohbR1miBGw=
+willnorris.com/go/imageproxy v0.8.1-0.20190326225038-d4246a08fdec h1:fc1f9n+GkWqcDYXvirpYG+v4ymo+e02QXyBgKmxI7VQ=
+willnorris.com/go/imageproxy v0.8.1-0.20190326225038-d4246a08fdec/go.mod h1:CKIesng3W4D4npJaypowqkxF33s3AH7EuohbR1miBGw=