Added DynamicYield SSH hosts.

.ssh/config.d/20_dynamicyield

+# Dynamic Yield
+
+Host github-dy
+HostName github.com
+User git
+IdentityFile ~/.ssh/dynamicyield
+
+Host bitbucket.org
+HostName bitbucket.org
+User git
+IdentityFile ~/.ssh/dynamicyield
+
+Host ipsec_server
+HostName 52.71.79.2
+User centos
+IdentityFile ~/.ssh/vpntest
+
+Host ipsec_client
+HostName 52.49.108.77
+User centos
+IdentityFile ~/.ssh/vpntest
+
+Host vpntest1
+HostName 54.194.246.76
+User centos
+IdentityFile ~/.ssh/vpntest
+
+Host vpntest2
+HostName 52.91.55.228
+User centos
+IdentityFile ~/.ssh/vpntest