test: Fix punctuation in exceptions for log env vars

The Exception text was missing a closing parenthesis, and for consistency
with other Exceptions it should not end with a period.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@195659 91177308-0d34-0410-b5e6-96231b3b80d8
Remove redundant assignment


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@195664 91177308-0d34-0410-b5e6-96231b3b80d8