AUTH-2052: Adds tests for SSH server

ssh_server_tests/ssh/authorized_keys_config

@@ -0,0 +1,5 @@
+Host *
+    AddressFamily inet
+
+Host {{hostname}}
+  ProxyCommand /usr/local/bin/cloudflared access ssh --hostname %h

ssh_server_tests/ssh/id_rsa

@@ -0,0 +1,49 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
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+-----END OPENSSH PRIVATE KEY-----

ssh_server_tests/ssh/id_rsa.pub

@@ -0,0 +1 @@
+ssh-rsa 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 mike@C02Y50TGJGH8

ssh_server_tests/ssh/short_lived_cert_config

@@ -0,0 +1,11 @@
+Host *
+    AddressFamily inet
+
+Host {{hostname}}
+  ProxyCommand bash -c '/usr/local/bin/cloudflared access ssh-gen --hostname %h; ssh -F /root/.ssh/short_lived_cert_config -tt %r@cfpipe-{{hostname}} >&2 <&1'
+
+Host cfpipe-{{hostname}}
+  HostName {{hostname}}
+  ProxyCommand /usr/local/bin/cloudflared access ssh --hostname %h
+  IdentityFile ~/.cloudflared/{{hostname}}-cf_key
+  CertificateFile ~/.cloudflared/{{hostname}}-cf_key-cert.pub