[tor-bugs] #20895 [Core Tor/Tor]: Split node_supports_ed25519_link_authentication into two or three separate functions

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#20895: Split node_supports_ed25519_link_authentication into two or three separate
functions
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 Reporter:  nickm         |          Owner:  nickm
     Type:  task          |         Status:  needs_revision
 Priority:  Low           |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  refactor      |  Actual Points:
Parent ID:  #15054        |         Points:  2
 Reviewer:  dgoulet       |        Sponsor:
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Comment (by nickm):

 So, my rationale is that if we want to know "does this support 3", then
 we'll be looking at `protocol_list_supports_protocol`.  That already
 exists.

 I'm not claiming that if a relay supports 4 it must support 3: I'm
 claiming that if it supports 4, it is okay to include an ed25519 key in
 its link specifiers.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20895#comment:13>
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