LTE: Add simple systemd launcher of LTE service

/reviewed-on nexedi/slapos!157

software/unstable/lte/instance.jinja2.cfg

+#
+# Deploy LTE instance
+#
+[buildout]
+parts =
+  directory
+  lte
+
+eggs-directory = {{ buildout['eggs-directory'] }}
+develop-eggs-directory = {{ buildout['develop-eggs-directory'] }}
+offline = true
+
+
+[instance-parameter]
+recipe = slapos.cookbook:slapconfiguration
+computer = ${slap_connection:computer_id}
+partition = ${slap_connection:partition_id}
+url = ${slap_connection:server_url}
+key = ${slap_connection:key_file}
+cert = ${slap_connection:cert_file}
+
+
+[directory]
+recipe = slapos.cookbook:mkdirectory
+home = ${buildout:directory}
+etc = ${:home}/etc
+var = ${:home}/var
+script = ${:etc}/run
+service = ${:etc}/service
+promise = ${:etc}/promise
+log = ${:var}/log
+
+[lte]
+recipe = slapos.recipe.build:download
+url = {{ buildout['directory'] }}/lte.sh
+destination = ${directory:service}/lte.sh
+mode = 0775
+md5sum = 9de4c400d411083d8ecd8d03d62b97f0

software/unstable/lte/lte.sh

+#!/bin/bash
+
+function stopLTE {
+  sudo /bin/systemctl stop lte
+  echo "LTE service stopped"
+  exit 0
+}
+trap stopLTE TERM INT KILL
+
+sudo /bin/systemctl start lte
+
+while (( 1 )); do 
+  sleep 1
+done

software/unstable/lte/readme.rst

+LTE eNodeB software release
+###########################
+
+Simple software release which starts LTE service upon instantiation.
+LTE is managed by systemd and we are taking advantage of this.
+
+It is necessary to install SlapOS from "amarisoft" branch because
+it has modified ``slapos node format`` to give group ``slapsoft``
+the rights to operate ``systemctl <start/stop/enable/disable> lte``.

software/unstable/lte/software.cfg

+[buildout]
+
+extends =
+  ../../../stack/slapos.cfg
+
+parts =
+  slapos-cookbook
+  instance-profile
+  lte.sh
+
+[instance-profile]
+recipe = slapos.recipe.template:jinja2
+template = ${:_profile_base_location_}/instance.jinja2.cfg
+rendered = ${buildout:directory}/instance.cfg
+md5sum = 3bbbb5297db5dd49f5dfc158e4291d4c
+mode = 0644
+extensions = jinja2.ext.do
+context =
+  section buildout buildout
+  
+[copy-to-instance]
+recipe  = slapos.recipe.build:download
+url     = ${:_profile_base_location_}/${:_buildout_section_name_}
+destination = ${buildout:directory}/${:_buildout_section_name_}
+
+[lte.sh]
+<= copy-to-instance
+md5sum = 9de4c400d411083d8ecd8d03d62b97f0