[vpnaas] Change CIRD for test subnets

The 10.10.0.0/24 subnet is overlapping with environment control network

Related-Prod: PRODX-41167
Change-Id: I3787da04b24b55ebef339765450fe150fc758bcf
(cherry picked from commit bb5d0bb7c46d69f2c4628d198aa165a1ea158b37)
1 file changed