Change default configuration to use SSH port 22

We no longer run a separate SSH daemon on port 2222. Change the default
configuration accordingly. Also remove some configuration files that are
no longer needed.
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

conf/aur-sshd.socket

-[Socket]
-ListenStream=2222
-Accept=yes
-
-[Install]
-WantedBy=sockets.target

conf/aur-sshd@.service

-[Unit]
-Description=AUR OpenSSH Per-Connection Daemon
-
-[Service]
-ExecStart=-/srv/http/aurweb/openssh/sshd -i -f /srv/http/aurweb/.ssh/sshd_config
-User=aur
-StandardInput=socket
-StandardError=syslog

conf/cgitrc.proto

 virtual-root=/cgit/
-clone-prefix=git+ssh://aur@aur.archlinux.org:2222
+clone-prefix=git+ssh://aur@aur.archlinux.org
 noheader=0
 logo=
 css=/css/cgit.css

conf/config.proto

@@ -20,7 +20,7 @@ disable_http_login = 1
 aur_location = https://aur.archlinux.org
 cgit_uri = https://aur.archlinux.org/cgit/
 git_clone_uri_anon = https://aur.archlinux.org/cgit/%s.git/
-git_clone_uri_priv = ssh+git://aur@aur.archlinux.org:2222/%s.git/
+git_clone_uri_priv = ssh+git://aur@aur.archlinux.org/%s.git/
 max_rpc_results = 5000
 aur_request_ml = aur-requests@archlinux.org
 request_idle_time = 1209600

scripts/git-integration/sshd_config

-Port 2222
-HostKey ~/.ssh/ssh_host_rsa_key
-PasswordAuthentication no
-UsePrivilegeSeparation no
-AuthorizedKeysCommand /srv/http/aurweb/scripts/git-integration/git-auth.py "%t" "%k"
-AuthorizedKeysCommandUser aur