Improve salt setup

This commit improves the salt setup of the Vagrant box:
- Salt output is reduced to log level warning
- Hosts entries are created for the internal IPs of all planned gva
  component VMs
- .bashrc and a .bash_functions sourced from it are now managed for the
  vagrant user
- the VM name has been changed to gva.local
- recent salt versions do not depend on m2crypto anymore, therefore it
  is now installed before x509certificate functions are called
- the rabbitmq_vhost for gva is now setup before any users are created
  because the previous implementation was broken with recent salt
  versions
- the gnuviechadmin-locale-data-compile step has been simplified because
  Django 1.9's compilemessages takes care of recursive .mo file
  compilation
- pillar data has been separated by role (especially queue permissions
  and credentials)
- salt configuration is now unified with gvaldap

roots/base/bash_functions

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+function devenv
+{
+    . $HOME/gvasettings.sh
+    . {{ venv }}/bin/activate
+    cd {{ appdir }}
+}
+
+function testenv
+{
+    devenv
+    export DJANGO_SETTINGS_MODULE=${DJANGO_SETTINGS_MODULE%%.local}.test
+}
+
+function settitle
+{
+    if [ -n "$STY" ] ; then      # We are in a screen session
+        echo "Setting screen titles to $@"
+        printf "\033k%s\033\\" "$@"
+        screen -X eval "at \\# title $@" "shelltitle $@"
+    else
+        printf "\033]0;%s\007" "$@"
+    fi
+}