CA-47135 Add "experimental" to RHEL 6 and Debian Squeeze templates

CA-47135 Add "experimental" to RHEL 6 and Debian Squeeze templates

Added "is_experimental" argument to make_long_name function, and added
optional "is_experimental" argument to template building functions. If
a template is experimental (untested), pass the argument
~is_experimental:true to the *_template function.

CA-48240: Debian Squeeze 32-bit shouldn't be experimental, Ubuntu 32-bit
and 64-bit should.

CP-1686: In Boston the Ubuntu templates should not be marked experimental
as they will be tested and supported.

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
Signed-off-by: David Scott <dave.scott@eu.citrix.com>