analyzer: get the element:pad names to put in the results
analyzer: get the element:pad names to put in the results

Makes it more meaningful and easier to read. Also remove the peer-pad
from our logs as the query is done on a single pad and is easier to
read it that way. Sometimes the query isn't done from one pad to another
but just on a single pad (elements querying their own pads) and it makes
it hard to differentiate when one element is querying other element's pads
or when it is doing it by itself.

thiagoss/gst-tracer-stats-tools,thiagoss/gst-tracer-stats-tools