vyos: T9261: defer heavy imports out of the Config/ConfigSession path

Importing vyos.config dragged in the whole HTTP and crypto stack. vyos.version
imported requests and urllib3 for get_remote_version(), plus vyos.system.image
for a single call in get_full_version_data() - and that reaches vyos.system.grub
and vyos.template, so every consumer paid for jinja2 as well. vyconf_session
imported vyos.remote, and therefore paramiko and cryptography, for a
get_config_file() used in two methods. All of these move to their call sites.

vyos/utils/__init__.py eagerly imported all 18 submodules, so 'from
vyos.utils.dict import get_sub_dict' also loaded auth, network and process.
It now resolves them on first attribute access via a module-level __getattr__.
No caller relied on the eager import; the common 'from vyos.utils.<sub> import
<name>' form is unaffected.

  import vyos.config    129.6 -> 47.7 ms  (-63%, 2.7x), 575 -> 194 modules
  import vyos.ifconfig  205.0 -> 149.7 ms (-27%, 1.4x)

This is per process, so it is paid again by every conf-mode script not handled
in-daemon by vyos-configd, every op-mode script, and every smoketest.

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