Suppress some bugs from the e-r graph page

Depending on exactly at what point a build in Jenkins is aborted,
sometimes it can end up with a result of FAILURE.  Since logstash
gets its data from Jenkins rather than Zuul, it doesn't know the
build has aborted.

Since ER gets its data from logstash, it also doesn't know that
some failures are actually just aborted builds.  We want to know
that we should ignore these failures for classification rate
purposes, but we should not display them on the graph page as they
are not actionable bugs.

Change-Id: If381e36144ffc03c0e36d3eb74ad7f24db245aa6
Merge "Suppress some bugs from the e-r graph page"