Removes "coverage" from default RUN. (#2750)
Removes "coverage" from default RUN. (#2750)

Having "coverage" in the default RUN is leaving ".coverprofile" files
all over the src tree. This commit removes this task from the default
RUN list for local work. It is included in travis.yml and will still run
for CI or when specified explicitly with a command line env var
  override.
jsha/boulder,ibukanov/boulder,bmw/boulder,jcjones/boulder,letsencrypt/boulder,lucasallan/boulder,lucasallan/boulder,lucasallan/boulder,letsencrypt/boulder,ibukanov/boulder,jcjones/boulder,jcjones/boulder,jsha/boulder,jcjones/boulder,jfrazelle/boulder,jfrazelle/boulder,jsha/boulder,letsencrypt/boulder,ibukanov/boulder,jfrazelle/boulder,bmw/boulder,jfrazelle/boulder,bmw/boulder