perf tools: Remove 'perf' from subcmd function and variable names

In preparation for moving exec_cmd.c and run-command.c out of perf and
into a library, remove 'perf' from all the symbol names.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/bc3ee82b40b8f396b644fa49e0f7260ce442635b.1450193761.git.jpoimboe@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/run-command.h b/tools/perf/util/run-command.h
index 1ef264d..cf7d655 100644
--- a/tools/perf/util/run-command.h
+++ b/tools/perf/util/run-command.h
@@ -41,7 +41,7 @@
 	unsigned no_stdin:1;
 	unsigned no_stdout:1;
 	unsigned no_stderr:1;
-	unsigned perf_cmd:1; /* if this is to be perf sub-command */
+	unsigned exec_cmd:1; /* if this is to be external sub-command */
 	unsigned stdout_to_stderr:1;
 	void (*preexec_cb)(void);
 };
@@ -51,7 +51,7 @@
 int run_command(struct child_process *);
 
 #define RUN_COMMAND_NO_STDIN 1
-#define RUN_PERF_CMD	     2	/*If this is to be perf sub-command */
+#define RUN_EXEC_CMD	     2	/*If this is to be external sub-command */
 #define RUN_COMMAND_STDOUT_TO_STDERR 4
 int run_command_v_opt(const char **argv, int opt);