[BACKPORT/21.2.x] Multiple dependency updates and fixes

[ptrus]

Backports the following:

• CI improvements #4039
• badger/migration: keep only last version when migrating non-managed DB #4037
• badger/migrate: num_go_routines flag fragment #4041
• build badgerdb using jemalloc #4040
• Enable development on macOS without docker #4024
• go/oasis-net-runner: Fix keymanager use determination #4042

[codecov]

Codecov Report

Merging #4045 (4d99acb) into stable/21.2.x (7616851) will decrease coverage by 0.68%.
The diff coverage is 23.07%.

@@                Coverage Diff                @@
##           stable/21.2.x    #4045      +/-   ##
=================================================
- Coverage          67.13%   66.45%   -0.69%     
=================================================
  Files                412      412              
  Lines              42271    42280       +9     
=================================================
- Hits               28380    28097     -283     
- Misses              9909    10214     +305     
+ Partials            3982     3969      -13     

Impacted Files	Coverage Δ
go/common/badger/helpers.go	34.61% <0.00%> (-1.03%)	⬇️
go/common/badger/migrate.go	4.00% <40.00%> (+4.00%)	⬆️
go/oasis-node/cmd/node/node.go	54.23% <100.00%> (-1.59%)	⬇️
go/oasis-node/cmd/ias/auth_registry.go	0.00% <0.00%> (-67.13%)	⬇️
...nsensus/tendermint/apps/keymanager/transactions.go	0.00% <0.00%> (-52.95%)	⬇️
go/ias/http/http.go	18.51% <0.00%> (-44.45%)	⬇️
go/keymanager/api/policy_sgx.go	23.07% <0.00%> (-15.39%)	⬇️
go/runtime/host/sandbox/sandbox.go	69.76% <0.00%> (-11.25%)	⬇️
go/consensus/tendermint/abci/state/state.go	54.54% <0.00%> (-9.10%)	⬇️
go/common/sgx/aesm/aesm.go	62.61% <0.00%> (-8.42%)	⬇️
... and 33 more

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