openssh: Add version 7.1

Several security issues are fixed as well new features added.

Please note the change below in OpenSSH 6.8.

>  * sshd(8): UseDNS now defaults to 'no'. Configurations that match
>   against the client host name (via sshd_config or authorized_keys)
>   may need to re-enable it or convert to matching against addresses.

It should be set to `yes` in our setup again.

Everybody should start using the ED25519 [1].

```
$ ssh-keygen -t ed25519
```

Additionally, the new host keys should be generated with `ssh-keygen -A`.

The utility `ssh-copy-id` and meta files are installed now, according to
the Linux from Scratch documentation [3].

[1] http://www.openssh.com/txt/release-6.8
[2] https://de.wikipedia.org/wiki/Curve25519
[3] http://www.linuxfromscratch.org/blfs/view/7.9/postlfs/openssh.html

openssh-7.1_p2-0.bee

@@ -0,0 +1,26 @@
+#!/bin/env beesh
+
+SRCURL[0]="http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-${PKGVERSION}${PKGEXTRAVERSION}.tar.gz"
+
+SYSCONFDIR=/etc/ssh
+DATADIR=/usr/share/sshd
+LIBEXECDIR=/usr/lib/openssh
+
+mee_configure() {
+    bee_configure \
+        --sysconfdir=${SYSCONFDIR} \
+        --with-md5-passwords \
+        --with-privsep-path=/var/lib/sshd \
+        --with-pam
+}
+
+mee_install_post() {
+    mv ${D}${SYSCONFDIR}/ssh_config ${D}${SYSCONFDIR}/ssh_config.example
+    mv ${D}${SYSCONFDIR}/sshd_config ${D}${SYSCONFDIR}/sshd_config.example
+    install -v -m755 ${S}/contrib/ssh-copy-id ${D}/${BINDIR}
+    install -v -m644 contrib/ssh-copy-id.1 \
+                     ${MANDIR}/man1
+    install -v -m755 -d ${DOCDIR}
+    install -v -m644 ${S}/{INSTALL,LICENCE,OVERVIEW,README*} \
+                     ${DOCDIR}
+}