We need a way to add options for blah_report (crm_report is supported too,
right?) when invoked from crmsh. The poor thing may need some extra information
if, for instance, it cannot find logs.

Obvious possibilities:

- add an environment variable which is then to be read in hb_report (say
BLAH_REPORT_OPTIONS); here one would need support in both *_report and crmsh

- add a crmsh configuration option (crm options blah_report_opts "...")

- add a crmsh getopt option (crm -x)

I don't know what would be the best way. Perhaps the middle one? What would be
your preference?