support kprobe wildcards

Example:

[root@localhost linux]#./ktap -e 'trace probe:vfs* { print(argevent) }'

[root@localhost linux]# cat /sys/kernel/debug/tracing/kprobe_events
p:ktap_kprobes_3035/vfs_truncate vfs_truncate
p:ktap_kprobes_3035/vfs_setpos vfs_setpos
p:ktap_kprobes_3035/vfs_llseek vfs_llseek
p:ktap_kprobes_3035/vfs_read vfs_read
p:ktap_kprobes_3035/vfs_write vfs_write
p:ktap_kprobes_3035/vfs_readv vfs_readv
p:ktap_kprobes_3035/vfs_writev vfs_writev
p:ktap_kprobes_3035/vfs_getattr_nosec vfs_getattr_nosec
p:ktap_kprobes_3035/vfs_getattr vfs_getattr
p:ktap_kprobes_3035/vfs_fstat vfs_fstat
p:ktap_kprobes_3035/vfs_fstatat vfs_fstatat
p:ktap_kprobes_3035/vfs_stat vfs_stat
p:ktap_kprobes_3035/vfs_lstat vfs_lstat
p:ktap_kprobes_3035/vfs_readlink vfs_readlink
p:ktap_kprobes_3035/vfs_path_lookup vfs_path_lookup
p:ktap_kprobes_3035/vfs_rmdir vfs_rmdir
p:ktap_kprobes_3035/vfs_unlink vfs_unlink
p:ktap_kprobes_3035/vfs_rename vfs_rename
p:ktap_kprobes_3035/vfs_symlink vfs_symlink
p:ktap_kprobes_3035/vfs_create vfs_create
p:ktap_kprobes_3035/vfs_mknod vfs_mknod
p:ktap_kprobes_3035/vfs_mkdir vfs_mkdir
...

In implementation, ktap find matched symbol from /proc/kallsyms.

This improvement was requested by Brendan Gregg.

Signed-off-by: Jovi Zhangwei <jovi.zhangwei@gmail.com>