Remove known issues section for 2.11.4
Remove known issues section for 2.11.4

As we will postpone the release for tomorrow, the bug will
be fixed in the release.

Signed-off-by: Helga Velroyen <2d0126b1ec6f9ec5cbec4a7012aa14faeaef10f5@google.com>
Reviewed-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>

grnet/snf-ganeti,ganeti-github-testing/ganeti-test-1,ganeti/ganeti,onponomarev/ganeti,yiannist/ganeti,ganeti/ganeti,apyrgio/ganeti,ganeti-github-testing/ganeti-test-1,leshchevds/ganeti,onponomarev/ganeti,andir/ganeti,bitemyapp/ganeti,yiannist/ganeti,andir/ganeti,bitemyapp/ganeti,dimara/ganeti,grnet/snf-ganeti,ganeti/ganeti,leshchevds/ganeti,mbakke/ganeti,dimara/ganeti,andir/ganeti,mbakke/ganeti,yiannist/ganeti,apyrgio/ganeti,leshchevds/ganeti,mbakke/ganeti