UB-1474: added logging message to indicate an idempotent issue

[olgashtivelman]

added a log message to indicate that a device was already unmounted. as part of this message we needed to add the volume WWN (to enable the automation to work and check this case) so some changes in the API were made to support this.

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This change is 

[coveralls]

Coverage increased (+0.02%) to 51.98% when pulling 71e9d8fb487524073d4c84b3e20bce7ea4e3f5ba on fix/UB-1474_add_idempotent_message into 01b687168ce391d7066bf487e3dd57afbbc4c5bf on dev.

[beckmani]

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remote/mounter/block_device_mounter_utils/block_device_utils_mounter_test.go, line 280 at r1 (raw file):

      It("should fail if unmount failed", func() {
          fakeBlockDeviceUtils.UmountFsReturns(callErr)
          err = blockDeviceMounterUtils.UnmountDeviceFlow("fake_device", "")

I would expect to have here a valid wwn string format

[beckmani]

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remote/mounter/block_device_mounter_utils/block_device_utils_mounter_test.go, line 287 at r1 (raw file):

          fakeBlockDeviceUtils.UmountFsReturns(nil)
          fakeBlockDeviceUtils.CleanupReturns(callErr)
          err = blockDeviceMounterUtils.UnmountDeviceFlow("fake_device", "")

I would expect to have here a valid wwn string format

[beckmani]

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remote/mounter/block_device_mounter_utils/block_device_utils_mounter_test.go, line 295 at r1 (raw file):

          fakeBlockDeviceUtils.UmountFsReturns(nil)
          fakeBlockDeviceUtils.CleanupReturns(nil)
          err = blockDeviceMounterUtils.UnmountDeviceFlow("fake_device", "")

I would expect to have here a valid wwn string format

[beckmani]

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remote/mounter/block_device_utils/fs.go, line 101 at r1 (raw file):

      }
      if !isMounted {
          b.logger.Info("Idempotent issue encountered - Device already unmounted.", logs.Args{{"mpath-device", mpoint}, {"volume-wwn", volumeWwn}})

Please specify the type of the Idempotent - "Idempotent (Mount) encountered....."