Use github issue instead of #warning directives in api_tests.cpp

[linh2931]

api_tests.cpp has 3 #warning directives

leap/unittests/api_tests.cpp

Line 1261 in 24b23ab

#warning TODO validate that the contract was successfully cached

#warning TODO validate that the contract was successfully cached

Those directives have been there since 06/07/2018.

Remove the directives and create this issue so it can be triaged

[heifner]

Could add a getter for cache size to wasm_interface, controller already has a get_wasm_interface(). The test could then check size of the cache before and after.