use a fork of golang-crypto with RFC8308 patches (#925)

The fork adds the following patches:

- ssh: add support for extension negotiation (rfc 8308)
  golang/crypto#197
- ssh: use extension negotiation (rfc 8308) in ssh clients
  rmohr/crypto@e4ed966

Closes: #916
Closes: #886

Author: dmacvicar

go.mod

@@ -23,4 +23,6 @@ require (
 
 replace git.apache.org/thrift.git => github.com/apache/thrift v0.0.0-20180902110319-2566ecd5d999
 
+replace golang.org/x/crypto v0.0.0-20220112180741-5e0467b6c7ce => github.com/dmacvicar/golang-x-crypto v0.0.0-20220126233154-a96af8f07497
+
 go 1.13

go.sum

@@ -63,6 +63,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/digitalocean/go-libvirt v0.0.0-20210723161134-761cfeeb5968 h1:ZdYBqLPrXioo+1Z97PWaTK4+jRcS45BI6JlepKtkPKI=
 github.com/digitalocean/go-libvirt v0.0.0-20210723161134-761cfeeb5968/go.mod h1:o129ljs6alsIQTc8d6eweihqpmmrbxZ2g1jhgjhPykI=
+github.com/dmacvicar/golang-x-crypto v0.0.0-20220126233154-a96af8f07497 h1:LBVsZYaxAt1v07hCDdhjL7F13238aw7ZLUOypcj/Uh8=
+github.com/dmacvicar/golang-x-crypto v0.0.0-20220126233154-a96af8f07497/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
@@ -276,8 +278,6 @@ golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191202143827-86a70503ff7e/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.0.0-20220112180741-5e0467b6c7ce h1:Roh6XWxHFKrPgC/EQhVubSAGQ6Ozk6IdxHSzt1mR0EI=
-golang.org/x/crypto v0.0.0-20220112180741-5e0467b6c7ce/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=