[Bug runtime/5705] New: Need more descriptive error messages on non-root systemtap invocation

["ananth at in dot ibm dot com" <sourceware-bugzilla at sourceware dot org>]

Currently, stap errors out on a non-root invocation with just a:

ERROR: unable to find either group "stapdev" or group "stapusr"

Though documentation pertaining to stapdev and stapusr are part of the stap(1)
manpage, IMO it is prudent to spell out a more detailed error message here.

Also, would it make sense to automagically create stapdev and stapusr groups
during systemtap install?

-- 
           Summary: Need more descriptive error messages on non-root
                    systemtap invocation
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: ananth at in dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=5705

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