repair: partial support for some options
repair: partial support for some options

Add partial support for the "incremental" option (only support the
"false" setting, i.e., not incremental repair) and the "parallelism"
option (the choice of sequential or parallel repair is ignored - we
always use our own technique).

This is needed because scylla-jmx passes these options by default
(e.g., "incremental=false" is passed to say this is *not* incremental
repair, and we just need to allow this and ignore it).

Signed-off-by: Nadav Har'El <625169824b719df98706d88646d0aae6f368ae4d@scylladb.com>

scylladb/scylla,avikivity/scylla,kjniemi/scylla,duarten/scylla,duarten/scylla,raphaelsc/scylla,scylladb/scylla,scylladb/scylla,raphaelsc/scylla,scylladb/scylla,avikivity/scylla,kjniemi/scylla,avikivity/scylla,raphaelsc/scylla,duarten/scylla,kjniemi/scylla