gitlab: fold sanitizer jobs into regular ubuntu jobs
gitlab: fold sanitizer jobs into regular ubuntu jobs

The sanitizer jobs run in ubuntu 20.04 containers and thus overlap with
testing already done for the regular ubuntu 20.04 build job. Fold the
sanitizer run for GCC into the regular build job and add a second
ubuntu 20.04 build job for CLang sanitizers.

Reviewed-by: Pavel Hrdina <d4772d05997b8abf035041e3b4f4996380ea7e7a@redhat.com>
Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

nertpinx/libvirt,libvirt/libvirt,jfehlig/libvirt,crobinso/libvirt,crobinso/libvirt,nertpinx/libvirt,crobinso/libvirt,crobinso/libvirt,nertpinx/libvirt,zippy2/libvirt,nertpinx/libvirt,jfehlig/libvirt,zippy2/libvirt,zippy2/libvirt,nertpinx/libvirt,libvirt/libvirt,olafhering/libvirt,olafhering/libvirt,jfehlig/libvirt,olafhering/libvirt,jfehlig/libvirt,libvirt/libvirt,zippy2/libvirt,olafhering/libvirt,libvirt/libvirt