Improve code coverage in CSI Operator

[safronovD]

Is your feature request related to a problem? Please describe.
Need to add UT for daemonset/deployment creation functions in CSI Operator
Examples:

• https://github.com/dell/csi-baremetal-operator/blob/master/pkg/scheduler_extender.go
• https://github.com/dell/csi-baremetal-operator/blob/master/pkg/node/node_daemonset.go
• https://github.com/dell/csi-baremetal-operator/blob/master/pkg/node_controller.go