* use tarantool data dictionary for phia settings; no need
to save or restore a scheme file.
* this is a mandatory removal before we ditch sfscheme object
and begin using key_def instead, since we are not going
to save/restore key_defs in a file

This feature already removed, just clean up box.info.phia() output.

No semantical code changes.

Get rid of "sophia objects", vtables and void *-style polymorphism.

* passing env to phia_getstring() does not work any more

Split keys by '.' to make output to be more YAML-friendly.

- Export phia_index_new(env, key_def) API
- Remove phia_configure() and phia_configure_storage()
- Remove se_confdb

Implementation already was removed from phia.c.

- Move start/stop hooks to coeio.c
- Don't invoke on_stop hook if on_start has failed

`tarantoolctl connect <URI>` connects to a remote tarantool
instance, specified by URI and opens an interactive console
session.

Unlike other tarantoolctl subcommands it doesn't operate on
instance names.

Fixes #1288

* remove so_free() from sophia object API

* use more verbose names