[PATCH 08/13] perf tools: Add the bash completion for listing subsubcommands of perf help

The bash completion does not support listing subsubcommands for 'perf help ', so fix it. Example: Before this patch: $ perf help $ As shown above, the subsubcommands of perf help does not come out. After this patch: $ perf help annotate buildid-cache data evlist

[PATCH 08/13] perf tools: Add the bash completion for listing subsubcommands of perf help

The bash completion does not support listing subsubcommands for 'perf help TAB', so fix it. Example: Before this patch: $ perf help TAB $ As shown above, the subsubcommands of perf help does not come out. After this patch: $ perf help TAB annotate buildid-cache data