Fix unit tests

[andreanegri]

Currently, client unit tests status (rcm/client/test/test.py) is

test_encryption (__main__.TestAESCipher) ... ERROR
test_encryption (__main__.TestD3DESCipher) ... ok
test_newcon_api (__main__.TestManager) ... vncviewer path: /home/vagrant/work/tv/opt/TurboVNC/bin/vncviewer
User:
Password:
ERROR
test_encryption (__main__.TestRCMCipher) ... ERROR
test_login_fail (__main__.TestSSHSessionWidget) ... ok
test_login_successful (__main__.TestSSHSessionWidget) ... ok

TestAESCipher and TestRCMCipher are failing for:

ModuleNotFoundError: No module named 'Crypto'

while TestManager has a bit convoluted behavior (i.e. expect input from user) and should not be a unit test to me.