Update slave_hosts_cfg.py, fix the test

BUG=skia:761

Review URL: https://codereview.chromium.org/639043005
Move skia-android-canary to skia-vm-014

BUG=skia:

Review URL: https://codereview.chromium.org/654213003
Update probers for offline slaves to use the new servers.

BUG=skia:

Review URL: https://codereview.chromium.org/657063003