Changes

Pin version of dogpile
Force dogpile to a static version as 1.0.0, released July 19, 2020 is
not compatible with the version of stevedore that we use.
Change-Id: Icc2758e07bafa935bf4403bd5735b47e79b4bc66 Signed-off-by:
beierlm <mark.beierl@canonical.com>
(cherry picked from commit 90d4e9e52ee085aeac044f1c48807ecf5f3742ee)
(cherry picked from commit 60f30ff08ed5db1c44c34c6887d7b7b2783c6bfa)