[tor-bugs] #14847 [Tor]: Controller: add a command to fetch HS descriptor from HSdir(s)

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#14847: Controller: add a command to fetch HS descriptor from HSdir(s)
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 Reporter:  dgoulet                     |          Owner:  dgoulet
     Type:  enhancement                 |         Status:  new
 Priority:  normal                      |      Milestone:  Tor:
Component:  Tor                         |  0.2.7.x-final
 Keywords:  SponsorR tor-hs controller  |        Version:
Parent ID:  #3521                       |  Actual Points:
                                        |         Points:
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 Last part of #3521, this is a bigger one. The ability to ask tor to fetch
 an HS descriptor from either the default HSdir set/replicas or onto the
 some specific ones given by the user.

 This particular command will trigger external connections to fetch those
 descriptors.

 Furthermore, we should think about if we want the results cached by the
 client or not which can have bad side effects depending on the intention.
 Considering #3523, if tor is able to do that at some point, there could be
 a use for this command to fetch and store a desc. from a specific HSdir.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14847>
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