Add sweepTokens() function

[hellwolf]

We need a way to get COMP, and other tokens out of the rDAI contract.

One possible solution:

• sweepTokens(address token) which is open for anyone to call, and sends any ERC20, excluding DAI and cDAI, to a manager account.
• setTokenManager(address newManager) which is limited to only the current manager.

Requirements:

• Ability to sweep tokens using a manager account
• DAI and cDAI are not able to be swept
• Tests are written to demonstrate functionality and edge-cases

Things to keep in mind:

• The admin keys will be destroyed soon. The above funcitonality should work indefinitely using a tokenManager account without admin powers.
• If you find gas optimizations and would like to implement them, let us know and we can increase the bounty, or make a new one.

Bounty amount: 300 DAI

[gitcoinbot]

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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This issue now has a funding of 600.0 DAI (600.0 USD @ $1.0/DAI) attached to it as part of the rtoken-project fund.

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[pi0neerpat]

PLEASE NOTE: the bounty amount is 300 DAI, not 600 DAI

[pi0neerpat]

Just to make sure, this is only for the rDAI contract?

Not sure what you mean?

[CrystalPony]

I've implemented the sweepTokens and tokenManager functionality as described, I did not write tests though.

#70

[gitcoinbot]

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Workers have applied to start work.

These users each claimed they can complete the work by 265 years, 7 months from now.
Please review their action plans below:

Learn more on the Gitcoin Issue Details page.

[gitcoinbot]

⚡️ A tip worth 400.00000 DAI (400.0 USD @ $1.0/DAI) has been granted to @CrystalPony for this issue from @pi0neerpat. ⚡️

The sender had the following public comments:

Great work!

Nice work @CrystalPony! Your tip has automatically been deposited in the ETH address we have on file.

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