dtlsagent: Clear the certificate upon finalize

Cleaning this up was likely just forgotten
17 jobs for master in 39 minutes and 27 seconds (queued for 4 minutes and 48 seconds)
latest
Status Job ID Name Coverage
  Preparation
passed #381387
gst indent

00:00:44

passed #381386
manifest

00:00:33

 
  Build
passed #381393
build cerbero android universal

00:14:30

passed #381394
build cerbero cross win32

00:08:23

passed #381395
build cerbero cross win64

00:06:11

passed #381392
build cerbero fedora x86_64

00:05:55

manual #381397
gst-ios-12.2 allowed to fail manual
build cerbero ios universal
passed #381396
gst-macos-10.14
build cerbero macos x86_64

00:06:47

passed #381388
build fedora x86_64

00:08:44

passed #381389
build nodebug fedora x86_64

00:06:46

passed #381390
build static fedora x86_64

00:11:14

passed #381391
build static nodebug fedora x86_64

00:11:26

 
  Test
passed #381398
check fedora

00:03:41

passed #381399
integration testsuites fedora

00:08:25

passed #381400
valgrind bad

00:05:52

 
  Integrate
passed #381401
android universal examples

00:07:08

passed #381402
documentation

00:03:47