cmd: Remove <common.h> and add needed includes

Remove <common.h> from all "cmd/" files and when needed add
missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/pcap.c b/cmd/pcap.c
index a014920..8d61096 100644
--- a/cmd/pcap.c
+++ b/cmd/pcap.c
@@ -4,8 +4,8 @@
  * Ramon Fried <rfried.dev@gmail.com>
  */
 
-#include <common.h>
 #include <command.h>
+#include <vsprintf.h>
 #include <net.h>
 #include <net/pcap.h>