requirements: Drop os-testr

It's not necessary in a world with stestr.

Change-Id: I0ea4a24984f2ce72fe0b11a64ba6d916704cc3c5
Signed-off-by: Stephen Finucane <[email protected]>

Author: stephenfin

lower-constraints.txt

@@ -35,7 +35,6 @@ netifaces==0.10.4
 openstacksdk==0.11.2
 os-client-config==1.28.0
 os-service-types==1.2.0
-os-testr==1.0.0
 osc-lib==1.8.0
 oslo.concurrency==3.25.0
 oslo.config==5.2.0

test-requirements.txt

@@ -6,7 +6,6 @@ hacking>=1.1.0,<1.2.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
-os-testr>=1.0.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD
 requests-mock>=1.2.0 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0