add pycrypto to requiremens

This is a paramiko dep, but isn't being installed as a requirement in jenkins (?)
add ecdsa to requiremens

This is also a paramiko dep, but isn't being installed as a requirement in jenkins

I also put this and pycrypto together at the bottom of requirements with a comment
Got to the bottom of requirements weirdness

The virtualenv initially did weird things when installing dependencies,
a reinstall fixed it.