Support checking sysctl security options about kernel-hardening-checker

[a13xp0p0v]

Checking sysctl parameters is supported now:

$ ./bin/kconfig-hardened-check 
usage: kconfig-hardened-check [-h] [--version] [-m {verbose,json,show_ok,show_fail}]
                              [-c CONFIG] [-l CMDLINE] [-s SYSCTL]
                              [-p {X86_64,X86_32,ARM64,ARM}]
                              [-g {X86_64,X86_32,ARM64,ARM}]

A tool for checking the security hardening options of the Linux kernel

options:
  -h, --help            show this help message and exit
  --version             show program's version number and exit
  -m {verbose,json,show_ok,show_fail}, --mode {verbose,json,show_ok,show_fail}
                        choose the report mode
  -c CONFIG, --config CONFIG
                        check the security hardening options in the kernel Kconfig file
                        (also supports *.gz files)
  -l CMDLINE, --cmdline CMDLINE
                        check the security hardening options in the kernel cmdline file
                        (contents of /proc/cmdline)
  -s SYSCTL, --sysctl SYSCTL
                        check the security hardening options in the sysctl output file
                        (`sudo sysctl -a > file`)
  -p {X86_64,X86_32,ARM64,ARM}, --print {X86_64,X86_32,ARM64,ARM}
                        print the security hardening recommendations for the selected
                        microarchitecture
  -g {X86_64,X86_32,ARM64,ARM}, --generate {X86_64,X86_32,ARM64,ARM}
                        generate a Kconfig fragment with the security hardening options
                        for the selected microarchitecture