Remove "cryptography" pkg dependencies from install_systests.sh.
Remove "cryptography" pkg dependencies from install_systests.sh.

Problem:
- There's no need to install build dependencies for the python
  "cryptography" package in the install_systests.sh script because
  those dependencies are now installed in the bastion's cloud-init.

Solution:
- Remove "apt-get install ..." lines from install_systests.sh.

michaeldayreads/marathon-bigip-ctlr,michaeldayreads/marathon-bigip-ctlr,michaeldayreads/marathon-bigip-ctlr