rewrite UPS-MIB discovery

git-svn-id: http://observium.org/svn/observer/trunk@4485 61d68cd4-352d-0410-923a-c4978735b2b8
clean up unnecessary sensor include files

git-svn-id: http://observium.org/svn/observer/trunk@4486 61d68cd4-352d-0410-923a-c4978735b2b8
poll numeric oids

git-svn-id: http://observium.org/svn/observer/trunk@4487 61d68cd4-352d-0410-923a-c4978735b2b8