Return whether channel is set as beneficiary or not

[Guillembonet]

To do this we need the list of all hermeses, it will be fetched from observer if possible or from parameters if it fails or no url is set.

Signed-off-by: Guillem Bonet guillem@mysterium.network

[codecov-commenter]

Codecov Report

Merging #4977 (22bbfdd) into master (5af906e) will decrease coverage by 0.06%.
The diff coverage is 25.42%.

@@            Coverage Diff             @@
##           master    #4977      +/-   ##
==========================================
- Coverage   39.16%   39.09%   -0.07%     
==========================================
  Files         359      360       +1     
  Lines       19093    19128      +35     
==========================================
+ Hits         7477     7478       +1     
- Misses      10888    10918      +30     
- Partials      728      732       +4     

Impacted Files	Coverage Δ
config/flags_node.go	9.24% <0.00%> (-0.16%)	⬇️
config/flags_observer.go	0.00% <0.00%> (ø)
core/beneficiary/saver.go	0.00% <ø> (ø)
core/node/options.go	0.00% <0.00%> (ø)
identity/registry/transactor.go	0.00% <0.00%> (ø)
mobile/mysterium/identity.go	0.00% <0.00%> (ø)
session/pingpong/hermes_promise_settler.go	33.64% <0.00%> (ø)
session/pingpong/hermes_url_getter.go	0.00% <ø> (ø)
tequilapi/contract/identity.go	0.00% <ø> (ø)
tequilapi/endpoints/identities.go	31.67% <6.89%> (-2.15%)	⬇️
... and 9 more

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