Add --times to e2e.go

Make each test available for execution --times times. Acts like a
multi-deck shoe. (Otherwise this is easily scriptable outside the
e2e.go command).

Useful for "I want to walk away for a few hours leaving some end-to-ends
running", until we have more stress tests. Also useful for detecting
flakes.

Reporting is changed to break out Passed, Flaky and Failed. I chose to
keep all three lines even if --times isn't on, just for consistency in
scraping. Similarly, it always outputs the counts now. A report looks
like:

2014/12/09 07:31:21 Passed tests: goe2e.sh[100/100] guestbook.sh[100/100] private.sh[100/100] services.sh[100/100]
2014/12/09 07:31:21 Flaky tests: basic.sh[99/100] certs.sh[99/100] monitoring.sh[98/100] pd.sh[98/100] update.sh[98/100]
2014/12/09 07:31:21 Failed tests:
2014/12/09 07:31:21 8 test(s) failed.
Add Test Anything Protocol (TAP) output to e2e.go

Adds a --tap option to change outputs to match the TAP format. Changes
pass/fail in general to "ok" / "not ok".
Make kube-down more robust for GCE provider
Add go1.4; fix cover path for real.
Remove duplicated assignment from API conversion
Only delete attached boot disks, don't delete other attached disks.
Modifies kubectl log cmd to not require container arg for single-container pods (for #2847)
Updates kubectl log cmd per PR feedback
Handle PD already being attached to the machine.
Fix GCE-PD so that it works even if the PD is already attached.
Add Session Affinity details to service type to support sticky session load balancer.
simplified session affinity attribute based on Brendan Burns feedback.