Updated rootful namespace home to var lib

[fgiorgetti]

• Only rootful namespace home has been updated to /var/lib
• Rootless remain as is assuming that XDG_DATA_HOME seems to be appropriate
  (see: https://specifications.freedesktop.org/basedir-spec/latest/)

Fixes #1689

[hash-d]

The changes themselves look good for me, but I think there is a couple of pre-existing documentation mistakes that could be looked into.

[hash-d]

I think this should be ${XDG_DATA_HOME}/skupper/namespaces, instead (ie, without .local/share, which is part of the default ${XDG_DATA_HOME}).

https://specifications.freedesktop.org/basedir-spec/latest/

$XDG_DATA_HOME defines the base directory relative to which user-specific data files should be stored. If $XDG_DATA_HOME is either not set or empty, a default equal to $HOME/.local/share should be used.

[hash-d]

Same here: ${XDG_DATA_HOME}/skupper/namespaces, instead.

[nluaces]

@fgiorgetti the Path Provider methods should be updated as well or they should be replaced?

[fgiorgetti]

@fgiorgetti the Path Provider methods should be updated as well or they should be replaced?

@nluaces In PR #1713 , @lynnemorrison already modified the Path Provider to use api.GetHostNamespaceHome,
so I believe it should be ok, as soon as it lands.