push in git/http timeout settings for repo sync invocations
push in git/http timeout settings for repo sync invocations

Roughly; if less than 1kb/s for a minute, terminate the git/http connection.
Bit heavy handed, but this is intended to make the hangs we've been having
crystal clear that they're occuring.

BUG=chromium:90675
TEST=ad hoc

Change-Id: I1e67b2f6fc4ae4713c6ccf239b75e43fe6133245
Reviewed-on: http://gerrit.chromium.org/gerrit/6241
Reviewed-by: Chris Sosa <959d3d631fb6f17f1b07f751372041a1edb210d1@chromium.org>
Reviewed-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Tested-by: Brian Harring <fdc2d0a2e2340b623587cee5ea8dff425d1eb1f3@chromium.org>

zhang0137/chromite,zhang0137/chromite,chadversary/chromiumos.chromite,zhang0137/chromite,chadversary/chromiumos.chromite,coreos/chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,coreos/chromite,coreos/chromite,bpsinc-native/src_third_party_chromite