Bump version to 2.21

6 jobs for release-2.21 in 326 minutes and 53 seconds (queued for 111 minutes and 47 seconds)
latest
Status Job ID Name Coverage
  Test
passed #2347
amd64
job_clang_amd64

02:57:45

passed #2351
amd64
job_clang_amd64_nosh

02:39:00

passed #2349
amd64
job_clang_py2_amd64

02:53:16

passed #2346
amd64
job_gcc_amd64

02:10:01

passed #2350
amd64
job_gcc_amd64_nosh

02:01:27

passed #2348
amd64
job_gcc_py2_amd64

02:11:51