setup.cfg: fix teuthology-openstack dependency

The PR #2050 "Revive teuthology-openstack" introduced new dependency
after refactoring partly of teuthology.openstack instance classes
to use api instead of command line. However the openstacksdk
added to wrong section options.extras_require.openstack, that
intended to be used for provisioning openstack nodes via libcloud,
which is optional and is not installable by default.

I.e. `pip install -e ".[openstack]"` must be used in order to get it.

However the refactoring forced unconditional openstack requirement.

That's why this dependency should go to options.install_requires in order
to make `pip install -e .` work again.

Fixes: 252ab4f

Signed-off-by: Kyr Shatskyy <kyrylo.shatskyy@clyso.com>

Author: Kyr Shatskyy

setup.cfg

@@ -44,6 +44,7 @@ install_requires =
     lxml
     ndg-httpsclient
     netaddr
+    openstacksdk # teuthology-openstack dependencies
     paramiko
     pexpect
     pip-tools
@@ -107,10 +108,10 @@ test =
     toml
     tox
     xmltodict
+# libcloud openstack dependencies
 openstack =
     python-openstackclient
     python-novaclient
-    openstacksdk
 
 [options.package_data]
 teuthology.openstack =