Implement API to encrypt and decrypt files using password

[dilshat]

We need to be able to encrypt and decrypt files using passwords.
These functionality is needed before uploading files to CDN and after downloading them to RH.
Also we need to mask passwords being passed in log files

[dilshat]

How to test:

1. Create file for testing echo "hello" >> /tmp/test
2. Run command subutai file encrypt -s /tmp/test -p pwd123
   Output should contain path to encrypted file
3. Verify that file exists ls /tmp/test.gpg
4. Run command subutai file decrypt -s /tmp/test.gpg -p pwd123
   Ouput should contain path to decrypted file
5. Verify that file exists ls /tmp/test-decrypted

[kurmanbekova6]

Followed the steps described above^^
Fixed in master