Only grab terminal when necessery and restore when done #414
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When we call lldb, we want to be owners of terminal for lldb to create interactive environment. But when ios-deploy is used within scripts, in some cases, it does not return terminal control and calling processes does not receive terminal inputs anymore.
For instance, calling ios-deploy from python and later trying to cancel script execution with ctrl+c does not work.
This does not grab terminal control when run in non-interactive mode and returns the control to parent group when lldb is done.