ciao-down: Add support for NO_PROXY
ciao-down: Add support for NO_PROXY

ciao-down provides some template helper functions that can be used inside
the userdata document to generate proxy strings for various uses.  These
strings included no_proxy but did not include NO_PROXY.  This commit
rectifies this omission.

Signed-off-by: Mark Ryan <f16215f7acd0bd7fdc465539215bd574c785b062@intel.com>

ciao-project/ciao,rbradford/ciao,markdryan/ciao,tpepper/ciao,markdryan/ciao,ciao-project/ciao,01org/ciao,rbradford/ciao,tpepper/ciao,kaccardi/ciao,01org/ciao,mcastelino/ciao,tpepper/ciao,kaccardi/ciao,mcastelino/ciao,mcastelino/ciao