renounce privileges

[ETeissonniere]

Modify the grants pallet so that the CancelOrigin can renounce its
privileges to call cancel_all_vesting_schedules for a given account.

[codecov]

Codecov Report

Merging #662 (3e1f5e6) into master (643b448) will increase coverage by 0.14%.
The diff coverage is 96.77%.

@@            Coverage Diff             @@
##           master     #662      +/-   ##
==========================================
+ Coverage   89.64%   89.79%   +0.14%     
==========================================
  Files          33       33              
  Lines        6169     6191      +22     
==========================================
+ Hits         5530     5559      +29     
+ Misses        639      632       -7     

Impacted Files	Coverage Δ
runtimes/eden/src/pallets_util.rs	0.00% <ø> (ø)
runtimes/eden/src/version.rs	0.00% <ø> (ø)
pallets/grants/src/lib.rs	68.46% <90.00%> (+5.50%)	⬆️
pallets/grants/src/benchmarking.rs	100.00% <100.00%> (ø)
pallets/grants/src/tests.rs	99.25% <100.00%> (+0.04%)	⬆️
node/src/service.rs	0.00% <0.00%> (ø)

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[aliXsed]

This feature could be a lot more useful if the origin of the root level operations which goes through pallet-mandate was configured to be a different collection of wallets or at least a higher threshold of yes (e.g. 3/4 vs 1/2) was required for mandating an upgrade. However with the current number of technical committee members, A 3/4th threshold would allow a mere two wallets to obstruct any future amendments which doesn't seem to be safe. So I'm leaning towards yes to this feature as it is and accept its limitation. With an improved government structure later, we can make sure that different privileged operations have different origins, when it makes them more reasonable or safer.

[aliXsed]

LGTM