Remove special handling for Consider Alive alive test

[ArnoStiefvater]

What:

Remove special handling for Consider Alive alive test.

Why:

When Consider Alive is chosen there was still some other ping method applied in the nasl preferences.
This resulted in a wrong print of the chosen alive method on nasl (host_alive_detection.nasl) side when boreas is used.
Boreas is the default now so this special case is not needed anymore.

How:

Do some simple scan.

    gvm-cli --protocol OSP socket --socketpath gbinstall/var/run/ospd-openvas.sock -X "\
    <start_scan scan_id='97079ee9-8917-49da-aa4f-4ef95f757ac1'>\
        <vt_selection>\
            <vt_single id='1.3.6.1.4.1.25623.1.0.100315'>\
                <vt_value id='9'>1</vt_value>\
                <vt_value id='6'>1</vt_value>\
                <vt_value id='3'>1</vt_value>\
            </vt_single>\
        </vt_selection>\
        <targets>\
            <target>\
                <alive_test>8</alive_test>\
                <hosts>127.0.0.1</hosts>\
                <ports>80,8080,443,22</ports>\
                <exclude_hosts></exclude_hosts>\
            </target>\
        </targets>\
        <scanner_params>\
        </scanner_params>\
    </start_scan>"

Without PR Host is alive, Methods used: TCP ping via Boreas Host Alive Scanner is in the results. With applied PR Host is alive, Methods used: ping via Boreas Host Alive Scanner is in the results. This is still not optimal but has to be improved on nasl side and at least does not display wrong information.

Checklist:

• Tests
• CHANGELOG Entry