Revert "unbound: Remove version 1.6.8"

This reverts commit 6aa5581.

Some GnuTLS files are linked against some libunbound.so.2`, so keep the
unbound package around, despite using Unbound anymore.

```
MISS libunbound.so.2                /usr/bin/danetool
MISS libunbound.so.2                /usr/bin/gnutls-cli
MISS libunbound.so.2                /usr/lib/libgnutls-dane.so.0.4.1
```

unbound.be0

@@ -0,0 +1,94 @@
+#!/usr/bin/env beesh
+
+# BEE_VERSION unbound-1.6.8-0
+
+## this file was created by bee init and should be executed to build a
+## bee-package. (Additional hints are located at the end of this file.)
+
+###############################################################################
+## The source URL(s) define the location of the sources that will be
+## downloaded. Version variables may be used to simplify reuse of this bee-file.
+
+SRCURL[0]="https://www.unbound.net/downloads/unbound-${PKGVERSION}.tar.gz"
+
+###############################################################################
+## Add URLs/pathes to patch files to the PATCHURL array.
+## The sources will be patched in the order of the array.
+
+# PATCHURL+=()
+
+###############################################################################
+## Add filename patterns to the EXCLUDE array of files that should not
+## be added to you package but may be present in the image directory.
+
+# EXCLUDE+=()
+
+###############################################################################
+## Uncomment the next statement, if the software may not be able to be build
+## outside the source directory and need to be build inside the source
+## directory.
+
+# build_in_sourcedir
+
+###############################################################################
+## bee cannot detect buildtypes specified in subdirectories.
+## Sometimes packages "hide" the real sources in a subdirectory named
+## 'src' or 'cmake' or ..
+## use 'sourcesubdir_append' to specify this directory if known.
+
+# sourcesubdir_append src
+
+
+###############################################################################
+## Change the default (auto-detected) steps to
+## extract, patch, configure/setup, build and install the software.
+## Make sure the mee_install function does install everything to the
+## image directory "${D}"
+
+#mee_extract() {
+#    bee_extract "${@}"
+#}
+
+#mee_patch() {
+#    bee_patch "${@}"
+#}
+
+mee_configure() {
+    bee_configure \
+        --disable-static \
+        --with-pidfile="/var/unbound/unbound.pid" \
+        --with-rootkey-file="/var/unbound/root.key"
+}
+
+mee_build() {
+    bee_build
+    ln -sf ${S}/testdata ${B}/testdata
+    start_cmd make check
+}
+
+#mee_install() {
+#    bee_install
+#}
+## by default this may be 'make install DESTDIR="${D}"'
+
+mee_install_post() {
+    start_cmd mv ${D}/etc/unbound/unbound.conf{,.sample}
+}
+
+###############################################################################
+##
+## Additional hints:
+##
+## The name of this bee-file should follow the following naming convention:
+##     pkgname-pkgversion-pkgrevision.bee
+##
+## You may remove all comments as long as SRCURL[0]="" is set.
+##
+## Everything in this file will be executed in a bash environment.
+##
+## Build the package by executing
+##     './pkg-version-N.bee' or
+##     'beesh ./pkg-version-N.bee'
+##
+## see http://beezinga.org/
+##