[DMV-28] add: - 'HostAwareFile'.

...sd/common/highwatermark/AlwaysAboveFreeSpaceProvider.java

.../cisd/common/highwatermark/DelegateFreeSpaceProvider.java

.../highwatermark/HighwaterMarkDirectoryScanningHandler.java

...temsx/cisd/common/highwatermark/HighwaterMarkWatcher.java

.../ch/systemsx/cisd/common/highwatermark/HostAwareFile.java

.../common/highwatermark/HostAwareFileWithHighwaterMark.java

...isd/common/highwatermark/NonHangingFreeSpaceProvider.java

...sx/cisd/common/highwatermark/SimpleFreeSpaceProvider.java

...hwatermark/HighwaterMarkDirectoryScanningHandlerTest.java

...x/cisd/common/highwatermark/HighwaterMarkWatcherTest.java