Guru Meditation Reports (GMR) code in oslo.reports was recently updated
to expect SIGUSR2 as opposed to SIGUSR1, because it is reserved by
Apache 'mod_wsgi' for its own use.
Signal was changed and merged in change:
I9d3b6079ba2cca41fe4723723a6f80b2c3c0b9c0
Change-Id: Id58dd3c32b095f4c6b14caf650d36f2fc7dfb12c