Update Bluepill recipes fix unwanted restarts of chef-server bits during admin node bringup. [1/2]

This pull request updates Bluepill to fix some regressions in bringing up
managed services without unneeded reboots.

Among other things, this will downgrade the BLuepill gem to version 0.0.51

 .../provisioner/recipes/setup_base_images.rb       |   45 +++++++++++---------
 .../default/provisioner-webserver.pill.erb         |   16 +++----
 .../provisioner/templates/default/tftpd.pill.erb   |    8 ++++
 3 files changed, 40 insertions(+), 29 deletions(-)

Crowbar-Pull-ID: c8d247c4c8237da96dc8c063f018bf8cb6230172

Crowbar-Release: pebbles