mkosi: Rename the configuration files to use ".conf" as extension

diff --git a/mkosi.conf.d/arch/10-mkosi.arch b/mkosi.conf.d/arch/10-arch.conf
similarity index 100%
rename from mkosi.conf.d/arch/10-mkosi.arch
rename to mkosi.conf.d/arch/10-arch.conf

diff --git a/mkosi.conf.d/centos/10-mkosi.centos b/mkosi.conf.d/centos/10-centos.conf
similarity index 100%
rename from mkosi.conf.d/centos/10-mkosi.centos
rename to mkosi.conf.d/centos/10-centos.conf

diff --git a/mkosi.conf.d/debian/10-mkosi.debian b/mkosi.conf.d/debian/10-debian.conf
similarity index 100%
rename from mkosi.conf.d/debian/10-mkosi.debian
rename to mkosi.conf.d/debian/10-debian.conf

diff --git a/mkosi.conf.d/fedora/10-mkosi.fedora b/mkosi.conf.d/fedora/10-fedora.conf
similarity index 100%
rename from mkosi.conf.d/fedora/10-mkosi.fedora
rename to mkosi.conf.d/fedora/10-fedora.conf

diff --git a/mkosi.conf.d/opensuse/10-mkosi.opensuse b/mkosi.conf.d/opensuse/10-opensuse.conf
similarity index 100%
rename from mkosi.conf.d/opensuse/10-mkosi.opensuse
rename to mkosi.conf.d/opensuse/10-opensuse.conf

diff --git a/mkosi.conf.d/ubuntu/10-mkosi.ubuntu b/mkosi.conf.d/ubuntu/10-ubuntu.conf
similarity index 100%
rename from mkosi.conf.d/ubuntu/10-mkosi.ubuntu
rename to mkosi.conf.d/ubuntu/10-ubuntu.conf