setup.py: move paramiko back to "install_requires"
setup.py: move paramiko back to "install_requires"

move following python modules back to "install_requires"

* apache-libcloud
* netaddr
* paramiko

they are imported even when teuthology is used by vstart_runner.py

Signed-off-by: Kefu Chai <a4b264ee037c625052534d60505bfd0db4776ac4@redhat.com>

dmick/teuthology,ceph/teuthology,SUSE/teuthology,dmick/teuthology,ktdreyer/teuthology,ktdreyer/teuthology,SUSE/teuthology,SUSE/teuthology,ceph/teuthology,dmick/teuthology