NoCustomer is not registered

Support older ruby

Refactor CustomerInfoForm to use find_by_format

Unused dead code

Merge branch 'nuke-legacy-customers'

* nuke-legacy-customers:
  Remove LegacyCustomer

Remove LegacyCustomer

Such customers are not longer a common or valid case.

Customer Info Forms and More Info

There's a bit extra info I wanted about users, so since I was doing this
anyway I figured I may as well port the existing forms to the new form
renderer.

Then, in order to fit within the guidelines I needed subforms, so
partials were added.

Move CustomerFwd behind Customer

All the previously-lazy BackendSgx data is now either all loaded or all not
loaded by swapping the sgx_repo used by your CustomerRepo instance.  When not
loaded the fields are filled with bottom values that explode when used.  When
loaded the values are present in RAM and not promises at all.  Most code paths
do not need any of the data, a few need most of it, so this seems like a good
trade-off.  Most code using this object will simply never touch those fields or
care about how they are loaded, etc.

Of course, most of this data isn't even SGX related and should move out of here,
but that would take a data model refactor/migration on the catapult_* schema.

Customer Info

This should allow us, the admins, to query information about a customer
without having to dive in and run a couple redis queries and some
database queries before getting the full picture of who we're talking
to.

It also allows the users to request some data about themselves. Balance and
phone number are already visible in other places, but their expiry is currently
not, and people have been asking about it.