[samples] Don't mix canadian samples with non-canadian ones.

- save the canadian smples in their own way, so as not to
mix non-canadian samples with canadian ones
- list canadian samples with the host information

# Compute Alpha-specific values

CT_DoArchTupleValues () {

    # The architecture part of the tuple:

    CT_TARGET_ARCH="${CT_ARCH}${CT_ARCH_ALPHA_VARIANT}"

    # The kernel ARCH:

    CT_KERNEL_ARCH=${CT_ARCH}

}