Updated `libsite.sh': new, fix, clean

New:

    New `core:imported()' function to check if a previous
    `core:softimport()' on a fiven module was successful or not.

    The deadman touch-file now contains the traceback to aid
    troubleshooting.

    `Makefile' updated with the ${SITE_SCM} path again, with a
    symbolic link that points to it from `~/.site/.scm'; mostly for
    unit-testing.

    Install `run' and `cache' directories under `/var/tmp/site/var'.

    `core:requires()' now also can depend on available vault secret
    ids.

Cleanup:

    All functions that produce code are now named with the suffix
    `.eval()', instead of a `:eval:' in the middle or nothing at all.

    Gave all module import return codes a name, and used those names.
Updated `module/unit': fix, cosmetic

Fixed a small reporting issue.
Updated `module/remote': clean

Dependency on `module/ldap' removed; this module no longer (directly
at least) depends on the ldap module.

The `.eval()' suffix cleanup applied.
Updated `module/hgd': graceful degredation
Unit test `hgd' updated
Updated `module/util': encapsulated `jsontool'
Unit test for `util' updated
Updated `module/cpf': added `HAS_AUTOED' theme option
Updated `module/gpg': clean
Updated `module/net': new, clean

New:

    :net:localportping() - for checking if a local tcp port is open or
    not without using a client (but using netstat instead).

    :net:freelocalport() - for finding free local ports to bind to,
    optionally taking a list of preferred ports to check first.

Cleanup:

    General cleanup.
Updated `module/ng': clean
Updated `module/vault': new, clean

The public `read()' function was split up into public and internal.

Unit test for the new private function added.

Cosmetic rearrangement of code.
Updated python code to align with vault module
Updated `libexec/softlayer': flag for cache added

Added a programatic flag (variable) to enable/disable caching, and
set that to false as softlayer API calls are not too costly.
New `module/softlayer'

New site module that interfaces with `extern/softlayer'.
New `module/mongo'
New `module/tunnel'
New `module/pagerduty'
New `module/capistrano'
Updated `travis'

Moved some package installs into the specific module requiring it in
order to reduce the shared build commands, thus speeding up all
builds as a result.