[MRG] replace utils.TempDirectory with run tmp

[hehouts]

Updated to runtmp in test_cmd_signature.py(1 test) and test_index.py (3 tests)

Chips away at #1386

[ctb]

your PR is looking good, @hehouts ! I think you're probably interested in runtmp.last_result.status, .out, and .err.

[codecov]

Codecov Report

Merging #1502 (6e8ca99) into latest (3b8793c) will increase coverage by 5.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           latest    #1502      +/-   ##
==========================================
+ Coverage   90.25%   95.27%   +5.02%     
==========================================
  Files         126       99      -27     
  Lines       21109    17405    -3704     
  Branches     1589     1589              
==========================================
- Hits        19051    16583    -2468     
+ Misses       1829      593    -1236     
  Partials      229      229              

Flag	Coverage Δ
python	95.27% <100.00%> (-0.01%)	⬇️
rust	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tests/test_cmd_signature.py	100.00% <100.00%> (ø)
tests/test_index.py	99.84% <100.00%> (-0.01%)	⬇️
src/core/src/cmd.rs
src/core/src/errors.rs
src/core/src/wasm.rs
src/core/src/index/storage.rs
src/core/src/ffi/hyperloglog.rs
src/core/tests/test.rs
src/core/src/sketch/minhash.rs
src/core/src/sketch/hyperloglog/estimators.rs
... and 19 more

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[ctb]

looking good!

[hehouts]

@ctb @bluegenes please review :)

The test print statements havent changed, so Im pretty sure theyre still working

[bluegenes]

looks great to me!

[ctb]

nice work!

[ctb]

@hehouts when it passes all the tests (I updated from latest again), please go ahead and merge ;)