ui: Remove unused DateTimeUtils methods

Removed unused methods in DateTimeUtils.

Change-Id: I9771aba4f7ab107cdfb300aa88797b70ae4f4e24
Signed-off-by: Allon Mureinik <amureini@redhat.com>
ui: Remove useless AbstractVmPopupWidget.constants

Removed the useless member constants form AbstractVmPopupWidget.

This member is only stored, but never used.

Change-Id: Icefd8fd1b46ade33e675964aa45b7cce77d75288
Signed-off-by: Allon Mureinik <amureini@redhat.com>
ui: Remove useless Task.state member

Removed the useless member state from the Task class.
This member was only stored and never read.

Change-Id: Ieac59fed7312c049971dcc874216b62c524f9060
Signed-off-by: Allon Mureinik <amureini@redhat.com>