[Rebase] Junos Integration

[joselopezrio]

Hello team,
the aim of this PR is to rebase and adapt the following PR -> #180

A new junos.ini file is added in along with adapted Rules and Decoders from the original PR. This is the result of the runtests.py execution:

- [ File = ./tests/SonicWall.ini ] ---------
........
- [ File = ./tests/apache.ini ] ---------
............
- [ File = ./tests/apparmor.ini ] ---------
.....
- [ File = ./tests/checkpoint_smart1.ini ] ---------
..................
- [ File = ./tests/cimserver.ini ] ---------
..
- [ File = ./tests/cisco_asa.ini ] ---------
.......................................................................................
- [ File = ./tests/cisco_ios.ini ] ---------
.....
- [ File = ./tests/cpanel.ini ] ---------
.......
- [ File = ./tests/doas.ini ] ---------
....
- [ File = ./tests/dovecot.ini ] ---------
...............
- [ File = ./tests/exim.ini ] ---------
.....
- [ File = ./tests/features.ini ] ---------
....
- [ File = ./tests/firewalld.ini ] ---------
..
- [ File = ./tests/mailscanner.ini ] ---------
.
- [ File = ./tests/mcafee_epo.ini ] ---------
.
- [ File = ./tests/modsecurity.ini ] ---------
......
- [ File = ./tests/named.ini ] ---------
.....
- [ File = ./tests/netscreen.ini ] ---------
....
- [ File = ./tests/nextcloud.ini ] ---------
.......
- [ File = ./tests/nginx.ini ] ---------
............
- [ File = ./tests/opensmtpd.ini ] ---------
.......
- [ File = ./tests/oscap.ini ] ---------
................................
- [ File = ./tests/ossec.ini ] ---------
.....
- [ File = ./tests/owlh.ini ] ---------
....
- [ File = ./tests/pam.ini ] ---------
.....
- [ File = ./tests/panda_paps.ini ] ---------
........
- [ File = ./tests/postfix.ini ] ---------
..
- [ File = ./tests/proftpd.ini ] ---------
.......
- [ File = ./tests/rsh.ini ] ---------
..
- [ File = ./tests/samba.ini ] ---------
....
- [ File = ./tests/sshd.ini ] ---------
...........................
- [ File = ./tests/su.ini ] ---------
.....
- [ File = ./tests/sudo.ini ] ---------
........
- [ File = ./tests/syslog.ini ] ---------
.....
- [ File = ./tests/sysmon.ini ] ---------
...
- [ File = ./tests/systemd.ini ] ---------
..
- [ File = ./tests/unbound.ini ] ---------

- [ File = ./tests/vsftpd.ini ] ---------
....
- [ File = ./tests/web_appsec.ini ] ---------
...............................
- [ File = ./tests/web_rules.ini ] ---------
.....
- [ File = ./tests/junos.ini ] ---------
...

Regards,
Jose Manuel Lopez

[MiguelCasaresRobles]

The file 0490-junos_decoders is not complete. This is the beginning of the file:

egex offset="after_parent">assembly-id="(\S+)"</regex>
    <order>assembly_id</order>
</decoder>