task/chdir-coredump:  Use readlink -e

realpath isn't available everywhere, use readlink -e instead.

Signed-off-by: Sam Lang <sam.lang@inktank.com>
Fixup latest commits that use /tmp/cephtest.

Signed-off-by: Sam Lang <sam.lang@inktank.com>
run.py: Add target name to logging info

Signed-off-by: Sam Lang <sam.lang@inktank.com>
nuke.py:  Allow name of job/run to be specified

Nuke will cleanup the base test directory by default, but can
cleanup the test directory for a given run if specified.

Signed-off-by: Sam Lang <sam.lang@inktank.com>
Merge branch 'wip-misc-fixes'

Signed-off-by: Sam Lang <sam.lang@inktank.com>