show device not yet polled message

git-svn-id: http://observium.org/svn/observer/trunk@4201 61d68cd4-352d-0410-923a-c4978735b2b8
...and print_warning().


git-svn-id: http://observium.org/svn/observer/trunk@4202 61d68cd4-352d-0410-923a-c4978735b2b8