before this change, we assume that node_exporter artifacts are
always located under `build/node_exporter`. but this could might
hold anymore, if we want to have a self-contained build, in the sense
that different builds do not share the same set of node_exporter
artifacts. this could be a waste as the node_exporter artifacts
are identical across different builds, but this makes things
a lot simpler -- different builds do not have to hardwire to
a certain directory.
so, a new option is added to `create-relocatable-package.py`, this
allows us to specify the directory where node_export artifacts
are located.
Refs #15241
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
e1d08d888a