Add pkcs11_provider defenition

Since we're leveraging native SSH connection plugin, we should
provide all supported parameters, otherwise plugin will fail with KeyError

Change-Id: I40d15cabf640d84d455d23286a25887c00aae52c

connection/ssh.py

@@ -270,6 +270,17 @@ DOCUMENTATION = '''
         cli:
           - name: timeout
         type: integer
+      pkcs11_provider:
+        version_added: '2.12'
+        default: ""
+        description:
+          - "PKCS11 SmartCard provider such as opensc, example: /usr/local/lib/opensc-pkcs11.so"
+          - Requires sshpass version 1.06+, sshpass must support the -P option.
+        env: [{name: ANSIBLE_PKCS11_PROVIDER}]
+        ini:
+          - {key: pkcs11_provider, section: ssh_connection}
+        vars:
+          - name: ansible_ssh_pkcs11_provider
 '''
 
 import functools