cli/wallet: show tx fee before relaying

[fyrchik]

Fix #2175 .
Signed-off-by: Evgeniy Stratonikov evgeniy@nspcc.ru

[roman-khimov]

We also need it for contract invocations (where we have --force already and it's OK to make this flag change fee behavior).

[AnnaShaleva]

And TestNEP17Transfer's regexp for network fee should be updated to a human-readable format.

[codecov]

Codecov Report

Merging #2180 (2a78ec8) into master (56dd7b7) will increase coverage by 0.00%.
The diff coverage is 76.92%.

@@           Coverage Diff           @@
##           master    #2180   +/-   ##
=======================================
  Coverage   83.74%   83.75%           
=======================================
  Files         295      295           
  Lines       28239    28264   +25     
=======================================
+ Hits        23650    23673   +23     
- Misses       3247     3249    +2     
  Partials     1342     1342           

Impacted Files	Coverage Δ
cli/wallet/nep11.go	78.43% <0.00%> (-1.19%)	⬇️
cli/smartcontract/smart_contract.go	89.28% <75.00%> (-0.21%)	⬇️
cli/input/input.go	52.77% <100.00%> (+18.16%)	⬆️
cli/wallet/nep17.go	75.97% <100.00%> (+0.25%)	⬆️
pkg/services/notary/notary.go	92.85% <0.00%> (+0.79%)	⬆️
pkg/network/discovery.go	98.58% <0.00%> (+1.41%)	⬆️

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