Remove dependencies on global settings

[Patrik-Stas]

This PR is refactoring a few things. It started with attempt to extract open_pool, init_core, open_wallet logic from api/ so that that these function would be located with other internal apis in src/*.rs. Having this done will enable start working on agent abstractions similar like what we have in agents/node/vcxagent-core
Many of wallet and pool tests started failing and it was difficult to figure out why as the logic in tests and utils/libindy/wallet was intertwined with reliance on global state in settings. Also when one test failed, it often caused domino effect as all wallet tests were using same wallet name. So I went down the rabbit hole and refactored the code a bit:

• renamed some functions
• removed some of the accesses to global state from utils/libindy and in tests. Instead, I made function interfaces more explicit. Where the function would previously read some data from global state (for example key derivation method), now it have to passed as argument
• all tests are now using RAW KDF ( i believe some previously were not), so testing might be somewhat faster
• Removed AgencyModeSetup for connection state machine tests - it was creating wallet but then mocking all calls into it - instead simple SetupIndyMocks works just fine for those tests.
• Similarly SetupAriesMocks, SetupStrictAriesMocks could now also be replaced by SetupIndyMocks
• SetupLibraryAgencyV1, SetupLibraryAgencyV1ZeroFees, SetupLibraryAgencyZeroFees were unused -> deleted
• SetupWalletAndPool was deleted - test which needs to mock wallet and pool (test_init_with_file, test_init_with_config, test_vcx_init_with_default_values, test_vcx_init_called_twice_fails) use SetupWallet
SetupPoolConfig to achieve the same result.

Signed-off-by: Patrik Stas patrik.stas@absa.africa

[Patrik-Stas]

Let's not try to merge this before release though.

[codecov-io]

Codecov Report

Merging #169 into master will increase coverage by 0.04%.
The diff coverage is 80.39%.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
+ Coverage   51.06%   51.10%   +0.04%     
==========================================
  Files         150      151       +1     
  Lines       22957    22923      -34     
  Branches     6059     6053       -6     
==========================================
- Hits        11722    11714       -8     
+ Misses       7628     7603      -25     
+ Partials     3607     3606       -1     

Flag	Coverage Δ
#unittests	51.10% <80.39%> (+0.04%)	⬆️

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

Impacted Files	Coverage Δ
libvcx/src/aries/mod.rs	1.09% <0.00%> (-7.03%)	⬇️
libvcx/src/utils/libindy/mod.rs	88.23% <ø> (ø)
libvcx/src/utils/libindy/pool.rs	34.78% <0.00%> (+4.01%)	⬆️
libvcx/src/utils/devsetup.rs	27.62% <44.44%> (+1.28%)	⬆️
libvcx/src/init.rs	45.94% <45.94%> (ø)
libvcx/src/settings.rs	55.70% <66.66%> (-0.29%)	⬇️
libvcx/src/api/vcx.rs	59.92% <69.69%> (+2.15%)	⬆️
libvcx/src/messages/agent_utils.rs	52.29% <75.00%> (+0.32%)	⬆️
libvcx/src/utils/libindy/wallet.rs	67.83% <82.60%> (-0.29%)	⬇️
libvcx/src/api/connection.rs	39.87% <100.00%> (ø)
... and 38 more

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