perf/core improvements and fixes:

User visible:

- Show extra line telling no entries below --percent-limit are
  at that --hierarchy level (Namhyung Kim)

- 'perf report/top --hierarchy' assorted alignment fixes (Namhyung Kim)

- Handle empty print fmts in 'perf script -s' i.e. when running
  python or perl scripts (Taeung Song)

- Improve support for bpf-output events in 'perf trace' (Wang Nan)

- Fix parsing of pmu events with empty list of modifiers, this
  cures a perf/core-only regression where '-e intel_pt//' got
  broken (Arnaldo Carvalho de Melo)

Infrastructure:

- Improve missing OpenJDK devel files error message in jvmti
  Makefile (Stephane Eranian)

- Remove duplicated code and needless script_spec__findnew() (Taeung Song)

- Bring perf_default_config to the very beginning at main(), removing
  the need for each subcommand to do this (Wang Nan)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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