test: accept env in interactive_tarantool.new()
It is needed to fix a problem in the `config-luatest/credentials_applier` test. See the next commit. NO_DOC=It is a testing helper improvement. NO_CHANGELOG=see NO_DOC NO_TEST=see NO_DOC
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It is needed to fix a problem in the `config-luatest/credentials_applier` test. See the next commit. NO_DOC=It is a testing helper improvement. NO_CHANGELOG=see NO_DOC NO_TEST=see NO_DOC
mentioned in commit 79c8ce04