Port list validation

[jjnicola]

What:
Perform port list validation before starting OpenVAS

Why:
To ensure it is a valid port

How:
Start a scan with an invalid port list with gvm-cli:

gvm-cli --protocol OSP --timeout 120 socket --socketpath=/home/juan/install/var/run/ospd/openvas.sock --xml "<start_scan scan_id='829097a9-85d5-4bb8-bac0-e64c362b2836'><targets><target><hosts>localhost</hosts><exclude_hosts></exclude_hosts><finished_hosts/><ports>2,-9,3</ports><credentials><credential port='22' service='ssh' type='up'><username>test</username><password>test</password></credential></credentials></target></targets><scanner_params><test_alive_hosts_only>0</test_alive_hosts_only></scanner_params><vt_selection><vt_single id='1.3.6.1.4.1.25623.1.0.14259'/></vt_selection></start_scan>" |xmlstarlet fo

Checklist:

• Tests
• CHANGELOG Entry

[jjnicola]

Depends on greenbone/ospd#393

[codecov]

Codecov Report

Merging #411 (2f27fef) into master (f5e388d) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #411      +/-   ##
==========================================
+ Coverage   84.17%   84.21%   +0.03%     
==========================================
  Files           9        9              
  Lines        1536     1539       +3     
==========================================
+ Hits         1293     1296       +3     
  Misses        243      243              

Impacted Files	Coverage Δ
ospd_openvas/daemon.py	67.53% <ø> (ø)
ospd_openvas/preferencehandler.py	89.55% <100.00%> (+0.10%)	⬆️

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