Add generic optional tool timeout

[devlead]

Currently some tools can hang with no chance of recovery, the ability to optionally set a timeout for would allow to take action in script and do retry or just abort on timeout.

[daveaglick]

Is the timeout opt-in or opt-out (I.e., will there be a default timeout for tools that don't specify an alternative)?

[devlead]

@daveaglick it's opt-in.

[devlead]

@daveaglick didn't wanna change any semantics in #831, could be a bigger discussion later if we should change default behavior or not.

[daveaglick]

👍 Cool, this is a good addition. Doesn't really make a difference one way or the other, just wanted to be sure I'm following the correct semantics since I've got some fairly long-running processes.

[devlead]

@daveaglick personally it will solve many mono issues where tools in sometimes takes 2 tries to work, i.e. nuget restore which is safe to run again 😉

[patriksvensson]

Closed via #831.