Feat(firewall): Rename `eth` to `firewall.sh`

The script is not only about ethernets.

diff --git a/playbooks/roles/debian/firewall/files/etc/network/if-down.d/eth b/playbooks/roles/debian/firewall/files/etc/network/if-down.d/firewall.sh
similarity index 100%
rename from playbooks/roles/debian/firewall/files/etc/network/if-down.d/eth
rename to playbooks/roles/debian/firewall/files/etc/network/if-down.d/firewall.sh

diff --git a/playbooks/roles/debian/firewall/files/etc/network/if-up.d/eth b/playbooks/roles/debian/firewall/files/etc/network/if-up.d/firewall.sh
similarity index 100%
rename from playbooks/roles/debian/firewall/files/etc/network/if-up.d/eth
rename to playbooks/roles/debian/firewall/files/etc/network/if-up.d/firewall.sh

diff --git a/playbooks/roles/redhat/firewall/files/etc/network/if-down.d/eth b/playbooks/roles/redhat/firewall/files/etc/network/if-down.d/firewall.sh
similarity index 100%
rename from playbooks/roles/redhat/firewall/files/etc/network/if-down.d/eth
rename to playbooks/roles/redhat/firewall/files/etc/network/if-down.d/firewall.sh

diff --git a/playbooks/roles/redhat/firewall/files/etc/network/if-up.d/eth b/playbooks/roles/redhat/firewall/files/etc/network/if-up.d/firewall.sh
similarity index 100%
rename from playbooks/roles/redhat/firewall/files/etc/network/if-up.d/eth
rename to playbooks/roles/redhat/firewall/files/etc/network/if-up.d/firewall.sh