Increase timeout for machineset tests

[Fedosin]

Currently, when running in CI, machineset tests sometimes fail with timeout error.

• Failure in Spec Teardown (AfterEach) [12.059 seconds]
MachineSet Reconciler
/go/src/github.com/openshift/machine-api-operator/pkg/controller/machineset/machineset_controller_test.go:31
  Should reconcile a MachineSet [AfterEach]
  /go/src/github.com/openshift/machine-api-operator/pkg/controller/machineset/machineset_controller_test.go:77
  Timed out after 10.000s.

To prevent this we increase the timeout to 20 seconds.

[lobziik]

/lgtm

[JoelSpeed]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JoelSpeed

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 7dd991f and 2 for PR HEAD dfe775b in total

[openshift-ci]

@Fedosin: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-azure-operator	dfe775b	link	false	/test e2e-azure-operator
ci/prow/e2e-metal-ipi-upgrade	dfe775b	link	false	/test e2e-metal-ipi-upgrade
ci/prow/e2e-vsphere-ovn-upgrade	dfe775b	link	false	/test e2e-vsphere-ovn-upgrade
ci/prow/e2e-gcp-ovn	dfe775b	link	false	/test e2e-gcp-ovn
ci/prow/e2e-vsphere-ovn	dfe775b	link	false	/test e2e-vsphere-ovn
ci/prow/e2e-openstack	dfe775b	link	false	/test e2e-openstack
ci/prow/e2e-libvirt	dfe775b	link	false	/test e2e-libvirt
ci/prow/e2e-metal-ipi-ovn-dualstack	dfe775b	link	false	/test e2e-metal-ipi-ovn-dualstack

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