Merge branch 'hotfix-1.0.4'
fix(xenperf): fix an output format problem

Xenperf was printing the results in a weird format, a combination
of spaces and tabulations which could be misunderstood by external
programs, so the new format is: separate the fiels with a single
space, everything else than a space is a field, put hyphens for empty
values.
Merge branch 'hotfix-1.0.5' into xenperf