net/cloud-init: Add ldconfig to rc.d script

rcorder shows that ldconfig is running after cloudinit in some cases.
This can lead to problems like the following when running it on
OpenStack:

Shared object "libpython2.7.so.1" not found, required by "python2.7"

• Reset maintainer by request of the current maintainer

PR: 224361
Submitted by: thompsa
Approved by: maintainer