Add support for printing kernel traces

Add a 'trace' command which uses the debugfs file created by the scoutfs
kernel module to read and print trace messages.

Signed-off-by: Zach Brown <zab@versity.com>

utils/src/sparse.h

@@ -24,12 +24,14 @@ extern unsigned int __builtin_ia32_crc32qi(unsigned int, unsigned char);
 typedef unsigned char u8;
 typedef unsigned short u16;
 typedef unsigned int u32;
+typedef int s32;
 typedef unsigned long long u64;
 typedef signed long long s64;
 
 typedef u8 __u8;
 typedef u16 __u16;
 typedef u32 __u32;
+typedef s32 __s32;
 typedef u64 __u64;
 
 typedef u16 __bitwise __le16;