go mod tidy

Signed-off-by: Bob Callaway <bcallaway@google.com>

go.sum

@@ -1056,8 +1056,6 @@ github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Z
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/btree v1.1.3 h1:CVpQJjYgC4VbzxeGVHfvZrv1ctoYCAI8vbl07Fcxlyg=
 github.com/google/btree v1.1.3/go.mod h1:qOPhT0dTNdNzV6Z/lhRX0YXUafgPLFUh+gZMl761Gm4=
-github.com/google/certificate-transparency-go v1.2.1 h1:4iW/NwzqOqYEEoCBEFP+jPbBXbLqMpq3CifMyOnDUME=
-github.com/google/certificate-transparency-go v1.2.1/go.mod h1:bvn/ytAccv+I6+DGkqpvSsEdiVGramgaSC6RD3tEmeE=
 github.com/google/certificate-transparency-go v1.2.2 h1:5TAzjQnCfN1vps2XWUgU6Svt++rgy9a+b8CBYXaKUAo=
 github.com/google/certificate-transparency-go v1.2.2/go.mod h1:d1o5XNQzK/yz8IXzEce6KXgMxfter/EcMP9vG4dBRNE=
 github.com/google/flatbuffers v2.0.8+incompatible/go.mod h1:1AeVuKshWv4vARoZatz6mlQ0JxURH0Kv5+zNeJKJCa8=
@@ -1600,27 +1598,22 @@ github.com/zeebo/errs v1.3.0 h1:hmiaKqgYZzcVgRL1Vkc1Mn2914BbzB0IBxs+ebeutGs=
 github.com/zeebo/errs v1.3.0/go.mod h1:sgbWHsvVuTPHcqJJGQ1WhI5KbWlHYz+2+2C/LSEtCw4=
 github.com/zeebo/xxh3 v1.0.2/go.mod h1:5NWz9Sef7zIDm2JHfFlcQvNekmcEl9ekUZQQKCYaDcA=
 github.com/zenazn/goji v0.9.0/go.mod h1:7S9M489iMyHBNxwZnk9/EHS098H4/F6TATF2mIxtB1Q=
-go.etcd.io/bbolt v1.3.10 h1:+BqfJTcCzTItrop8mq/lbzL8wSGtj94UO/3U31shqG0=
-go.etcd.io/bbolt v1.3.10/go.mod h1:bK3UQLPJZly7IlNmV7uVHJDxfe5aK9Ll93e/74Y9oEQ=
 go.etcd.io/bbolt v1.3.11 h1:yGEzV1wPz2yVCLsD8ZAiGHhHVlczyC9d1rP43/VCRJ0=
+go.etcd.io/bbolt v1.3.11/go.mod h1:dksAq7YMXoljX0xu6VF5DMZGbhYYoLUalEiSySYAS4I=
 go.etcd.io/etcd/api/v3 v3.6.0-alpha.0 h1:se+XckWlVTTfwjZSsAZJ2zGPzmIMq3j7fKBCmHoB9UA=
 go.etcd.io/etcd/api/v3 v3.6.0-alpha.0/go.mod h1:z13pg39zewDLZeXIKeM0xELOeFKcqjLocfwl5M820+w=
 go.etcd.io/etcd/client/pkg/v3 v3.6.0-alpha.0 h1:2UyRzFWbZZzgu/xzxoRukgixvafiJtGyxO+3IKUyJ6c=
 go.etcd.io/etcd/client/pkg/v3 v3.6.0-alpha.0/go.mod h1:Vl/FkH40bHqmBFwhr8WVKtV47neyts36zl1voccRq8s=
-go.etcd.io/etcd/client/v2 v2.305.15 h1:VG2xbf8Vz1KJh65Ar2V5eDmfkp1bpzkSEHlhJM3usp8=
-go.etcd.io/etcd/client/v2 v2.305.15/go.mod h1:Ad5dRjPVb/n5yXgAWQ/hXzuXXkBk0Y658ocuXYaUU48=
 go.etcd.io/etcd/client/v2 v2.305.16 h1:kQrn9o5czVNaukf2A2At43cE9ZtWauOtf9vRZuiKXow=
+go.etcd.io/etcd/client/v2 v2.305.16/go.mod h1:h9YxWCzcdvZENbfzBTFCnoNumr2ax3F19sKMqHFmXHE=
 go.etcd.io/etcd/client/v3 v3.6.0-alpha.0 h1:hHaJ8CvTPJ9iv7xPz3G0gxt3csEqJW8evgty/kYICwo=
 go.etcd.io/etcd/client/v3 v3.6.0-alpha.0/go.mod h1:a9JuChoQBDnw7WclHYBYCtTOIC12Wwj+Fw0LX4TI/Gs=
-go.etcd.io/etcd/pkg/v3 v3.5.15 h1:/Iu6Sr3iYaAjy++8sIDoZW9/EfhcwLZwd4FOZX2mMOU=
-go.etcd.io/etcd/pkg/v3 v3.5.15/go.mod h1:e3Acf298sPFmTCGTrnGvkClEw9RYIyPtNzi1XM8rets=
 go.etcd.io/etcd/pkg/v3 v3.5.16 h1:cnavs5WSPWeK4TYwPYfmcr3Joz9BH+TZ6qoUtz6/+mc=
-go.etcd.io/etcd/raft/v3 v3.5.15 h1:jOA2HJF7zb3wy8H/pL13e8geWqkEa/kUs0waUggZC0I=
-go.etcd.io/etcd/raft/v3 v3.5.15/go.mod h1:k3r7P4seEiUcgxOPLp+mloJWV3Q4QLPGNvy/OgC8OtM=
+go.etcd.io/etcd/pkg/v3 v3.5.16/go.mod h1:+lutCZHG5MBBFI/U4eYT5yL7sJfnexsoM20Y0t2uNuY=
 go.etcd.io/etcd/raft/v3 v3.5.16 h1:zBXA3ZUpYs1AwiLGPafYAKKl/CORn/uaxYDwlNwndAk=
-go.etcd.io/etcd/server/v3 v3.5.15 h1:x35jrWnZgsRwMsFsUJIUdT1bvzIz1B+29HjMfRYVN/E=
-go.etcd.io/etcd/server/v3 v3.5.15/go.mod h1:l9jX9oa/iuArjqz0RNX/TDbc70dLXxRZo/nmPucrpFo=
+go.etcd.io/etcd/raft/v3 v3.5.16/go.mod h1:P4UP14AxofMJ/54boWilabqqWoW9eLodl6I5GdGzazI=
 go.etcd.io/etcd/server/v3 v3.5.16 h1:d0/SAdJ3vVsZvF8IFVb1k8zqMZ+heGcNfft71ul9GWE=
+go.etcd.io/etcd/server/v3 v3.5.16/go.mod h1:ynhyZZpdDp1Gq49jkUg5mfkDWZwXnn3eIqCqtJnrD/s=
 go.mongodb.org/mongo-driver v1.14.0 h1:P98w8egYRjYe3XDjxhYJagTokP/H6HzlsnojRgZRd80=
 go.mongodb.org/mongo-driver v1.14.0/go.mod h1:Vzb0Mk/pa7e6cWw85R4F/endUC3u0U9jGcNU603k65c=
 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=