* allow to load json marked as unsafe or vault
* centralized json code/decode, add vault support
* use generics to allow for more varied inputs
* allow inventory to dump vault w/o decrypting
* override simplejson also
* add entry for unsafe also
* load vaulted and unsafe json, support unvaulting if secrets provided
I wrote this code because we had a traceback at some point with pyyaml
not able to handle our AnsibleUnicode type (the C library was doing an
exact match to python's unicode type rather than testing with the object
inheritance hierarchy.) Neither jimi think that AnsibleUnicode gets
passed into this function anymore, though, so we think it is safe to remove.