p2p: Bump time allowing p2p to be used from two to five days. It's quite unreasonable to expect a site to complete an update of their entire fleet in just two days. BUG=chromium:343365 TEST=Unit tests pass. Change-Id: I974e4573b10acc319661e064ed3f329b6344407f Previous-Reviewed-on: https://chromium-review.googlesource.com/187936 (cherry picked from commit 472b205c8afdb22ba22ba12ece667263b0e4fb99) Reviewed-on: https://chromium-review.googlesource.com/189100 Reviewed-by: David Zeuthen <[email protected]> Commit-Queue: David Zeuthen <[email protected]> Tested-by: David Zeuthen <[email protected]>