initial PW1 123456 test cases

test/features/851_decryption.feature

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+Feature: decryption 
+  In order to use a token
+  A token should decrypt encrypted data
+
+  Scenario: decrypt by OPENPGP.2 key (1)
+     Given a plain text "This is a test message."
+     And encrypt it on host with RSA key pair 1
+     And let a token decrypt encrypted data
+     Then decrypted data should be same as a plain text
+
+  Scenario: decrypt by OPENPGP.2 key (2)
+     Given a plain text "RSA decryption is as easy as pie."
+     And encrypt it on host with RSA key pair 1
+     And let a token decrypt encrypted data
+     Then decrypted data should be same as a plain text
+