Test case added for importing packages



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@181472 91177308-0d34-0410-b5e6-96231b3b80d8
Quiet g++-4.7 warnings about const issues and fix the scope of the "if (IsValid())".

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@181474 91177308-0d34-0410-b5e6-96231b3b80d8
Now that you can "command script import" packages, the docs should reflect the best practice



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@181475 91177308-0d34-0410-b5e6-96231b3b80d8