🐛 Revert "Fix dnsmasq config ipv6 issues"

[elfosardo]

Reverts #708

After testing this patch on an actual ipv6 deployment, we've verified that this change breaks dnsmasq and ip assignment
The router option does work as expected instead

dnsmasq: started, version 2.85 DNS disabled
dnsmasq: compile time options: IPv6 GNU-getopt DBus no-UBus no-i18n IDN2 DHCP DHCPv6 no-Lua TFTP no-conntrack ipset auth cryptohash DNSSEC loop-detect inotify dumpfile
dnsmasq-dhcp: DHCPv6, IP range fd00:1101::a -- fd00:1101::ffff:ffff:ffff:fffe, lease time 1d
dnsmasq-dhcp: router advertisement on fd00:1101::
dnsmasq-dhcp: RTR-ADVERT(enp1s0) fd00:1101::
dnsmasq-dhcp: IPv6 router advertisement enabled
dnsmasq-dhcp: DHCP, sockets bound exclusively to interface enp1s0

[Rozzii]

@nuhakala

[Rozzii]

/cc @nuhakala

[elfosardo]

/cc @dtantsur @iurygregory

[Rozzii]

Let's have a discussion about this because in case #708 is faulty we have a faulty way to deploy ipv6 only environment in dev-env too and need to fix how we evaluate ipv6 fixes.

[elfosardo]

/test metal3-centos-e2e-integration-test-main metal3-ubuntu-e2e-integration-test-main

[elfosardo]

/hold
until we have discussed this

[Rozzii]

/hold cancel
Let's revert until we 100% clarified the expected content of the config .
/lgtm

[Rozzii]

/cherry-pick release-31.0.0

[metal3-io-bot]

@Rozzii: once the present PR merges, I will cherry-pick it on top of release-31.0.0 in a new PR and assign it to you.

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[iurygregory]

/approve

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[metal3-io-bot]

@Rozzii: cannot checkout release-31.0.0: error checking out "release-31.0.0": exit status 1 error: pathspec 'release-31.0.0' did not match any file(s) known to git

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/cherry-pick release-31.0.0

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[tuminoid]

/cherry-pick release-31.0

[metal3-io-bot]

@tuminoid: new pull request created: #725

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In response to this:

/cherry-pick release-31.0

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