[feature] allow manual gateway selection for vpn

For now, the way to select a gateway is to add a section in
bitmaskd.cfg:

  [vpn_prefs]
  locations = ["frankfurt", "seattle__wa"]
  countries = ["DE", "US"]

Note that the location indication has priority over country code.

This will be exposed by the UI in release 0.11

- Resolves: #8855

1 files changed, 39 insertions, 0 deletions

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+:LastChangedDate: $LastChangedDate$
+:LastChangedRevision: $LastChangedRevision$
+:LastChangedBy: $LastChangedBy$
+
+.. _vpn:
+
+
+Bitmask VPN
+================================
+
+The Bitmask VPN Module
+
+Gateway Selection
+-----------------------------------
+
+By default, the Gateway Selector will apply a heuristic based on the configured
+timezone of the system.  This will choose the closest gateway based on the
+timezones that the provider states in the ``eip-config.json`` file.
+
+If the locations section is not properly set by the provider, or if the user
+wants to manually override the selection, the only way to do this for the
+``0.10`` version of Bitmask is to add a section to the ``bitmaskd.cfg``
+configuration file::
+
+  [vpn_prefs]
+  locations = ["rio__br"]
+  countries = ["BR", "AR", "UY"]
+
+Take into account that the locations entry has precedence over the country codes enumeration.
+
+Also, the normalization is done so that any non-alphabetic character is substituted by an underscore ('``_``).
+
+You can list all the configured locations using the CLI::
+
+  % bitmaskctl vpn list
+  demo.bitmask.net      [DE] Frankfurt (UTC+1)
+  demo.bitmask.net      [US] Seattle, WA (UTC-7)
+
+This manual override functionality will be exposed through the UI and the CLI in release ``0.11``.