fix(OpenStack):setting compute api version via config

[dweinholz]

Provide compuite API version via config

#974

Also the Branch https://github.com/deNBI/simplevm-portal/tree/feat/compute_api_version should be merged but currently github shows an eror when trying to create a PR

Try to fulfill the following points before the Pull Request is merged:

• Give a meaningfull description for the PR
• The PR is reviewed by one of the team members.
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• If the requirements.txt have changed, check if the patches still work
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• If the PR is merged in the master then a release should be be made.
• If the new code is readable, if not it should be well commented

For any changes of the code please consider:

• Cover the changes with corresponding unit tests

For releases only:

• If the review of this PR is approved and the PR is followed by a release then the .env file
  in the cloud-portal repo should also be updated.
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[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
simple_vm_client
VirtualMachineHandler.py	224	21	21	91%
__init__.py	1	0	100%
simple_vm_client/benchmark
__init__.py	0	0	100%
test_service.py	52	36	36	31%
simple_vm_client/bibigrid_connector
__init__.py	0	0	100%
bibigrid_connector.py	135	36	36	73%
test_bibigrid_connector.py	119	0	100%
simple_vm_client/flavor_resource_exporter_connector
__init__.py	2	0	100%
flavor_resource_exporter_connector.py	131	17	17	87%
test_flavor_resource_exporter_connector.py	242	0	100%
simple_vm_client/forc_connector
__init__.py	0	0	100%
forc_connector.py	325	28	28	91%
simple_vm_client/forc_connector/playbook
__init__.py	0	0	100%
playbook.py	189	0	100%
test_playbook.py	381	0	100%
simple_vm_client/forc_connector/template
__init__.py	0	0	100%
template.py	229	14	14	94%
simple_vm_client/metadata_connector
metadata_connector.py	112	26	26	77%
test_metadata_connector.py	68	0	100%
simple_vm_client/openstack_connector
__init__.py	0	0	100%
openstack_connector.py	1161	220	220	81%
test_openstack_connector.py	1290	2	2	99%
simple_vm_client/tests
test_virtualmachinehandler.py	325	0	100%
simple_vm_client/util
__init__.py	0	0	100%
state_enums.py	70	0	100%
test_thrift_converter.py	170	0	100%
thrift_converter.py	80	3	3	96%
TOTAL	5306	403	92%

Tests	Skipped	Failures	Errors	Time
339	0 💤	0 ❌	0 🔥	6.876s ⏱️