Virtualhost config with remap rules

[serrislew]

Initial POC to support virtualhost config schema with remap rules.

• Resolves to a single virtualhost entry
  • Remap rule logic remains the same. Order ranking still applies (i.e. rules defined first have priority)
  • Virtualhost remap rules have priority. If no remap rule matches or virtualhost is found, existing remap.config is then considered
• Virtualhost domains support exact and wildcard (only single left-most "*") matching
• Supports traffic_ctl config reload of single virtualhost entry

$ traffic_ctl config reload --virtualhost foo
┌ Virtualhost: foo
└┬ Reload status: ok
 ├ Message: Virtualhost successfully reloaded

TODO:

• add docs