Order gas costs

[matevz]

oasis network show gas-costs returns key-values in non-deterministic order which is annoying for running the examples, for example:

Gas costs for network mainnet:
  - reclaim_escrow:            1000
  - amend_commission_schedule: 1000
  - burn:                      1000
  - allow:                     1000
  - transfer:                  1000
  - withdraw:                  1000
  - add_escrow:                1000

Gas costs for network mainnet:
  - add_escrow:                1000
  - amend_commission_schedule: 1000
  - burn:                      1000
  - allow:                     1000
  - transfer:                  1000
  - withdraw:                  1000
  - reclaim_escrow:            1000

Sort it alphabetically or so.

[amela]

Closing - Ordered by @matevz: #110