Fix -i for KASLR

We can't get kaslr_offset by -i vmcoreinfo_text_file.
So we get it from /proc/vmcore or a dump file,
and execute symbol_address += kaslr_offset.

Signed-off-by: Kazuhito Hagio <k-hagio@ab.jp.nec.com>
Signed-off-by: Masaki Tachibana <mas-tachibana@vf.jp.nec.com>