Ansible-vault non-functioning

[Fmstrat]

Reopening a vault issue since the "debian8" and "debian9" tags don't have the appropriate libraries.

ERROR! ansible-vault requires either the cryptography library (preferred) or pycrypto in order to function. for /data/environments/test/stacks/opgen-api/secrets/opgen-api-config

[jeansebastienh]

It's linked to

$ apt-get -f -y --auto-remove remove python-pip
...
The following packages will be REMOVED:                                                                                                                                                                                                       
  binutils build-essential cpp cpp-6 dbus dpkg-dev fakeroot g++ g++-6 gcc gcc-6 gir1.2-glib-2.0 libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl libapparmor1 libasan3 libatomic1 libc-dev-bin libc6-dev libcc1-0     
  libcilkrts5 libdbus-1-3 libdbus-glib-1-2 libdpkg-perl libexpat1-dev libfakeroot libfile-fcntllock-perl libgcc-6-dev libgdbm3 libgirepository-1.0-1 libglib2.0-0 libglib2.0-data libgomp1 libicu57 libisl15 libitm1 liblocale-gettext-perl   
  liblsan0 libmpc3 libmpfr4 libmpx2 libperl5.24 libpython-all-dev libpython-dev libpython2.7 libpython2.7-dev libquadmath0 libstdc++-6-dev libtsan0 libubsan0 libxml2 linux-libc-dev make manpages-dev netbase patch perl perl-modules-5.24   
  python-all python-all-dev python-cffi-backend python-crypto python-cryptography python-dbus python-dev python-enum34 python-gi python-idna python-ipaddress python-keyring python-keyrings.alt python-pip python-pip-whl                    
  python-pkg-resources python-pyasn1 python-secretstorage python-setuptools python-six python-wheel python-xdg python2.7-dev rename sgml-base shared-mime-info xdg-user-dirs xml-core                                                         
0 upgraded, 0 newly installed, 87 to remove and 23 not upgraded

https://github.com/William-Yeh/docker-ansible/blob/master/debian9/Dockerfile#L37