fix bug: check number of parameter of robot_mitigation_action

Signed-off-by: jason <liu_yt@neusoft.com>
New Feature: web defacement protection

Module name: web_defacement

Directives:

1) web_defacement on/off
2) web_defacement_original /path/to/original/files
3) web_defacement_hash_data /path/to/hash/data/file
4) web_defacement_log on/off
5) web_defacement_index index.html

All above directives are used in http/server/location

Variables:

1) $web_defacement
2) $web_defacement_file

Signed-off-by: paulyang <y_y@neusoft.com>
Merge branch 'web_defacement'