Rename os-config-applier to os-apply-config

There are some elements that are still using the old os-config-applier
to store the configuration templates.

Change-Id: I17def1e5e0ca09d5f400d7ba1f7bd82ea804ab42
Make 74-cinder-tgt executable.

This post install script wasn't executing due to
invalid file permissions.

Change-Id: I6984cb6e220db6b379f325fa69c458c0f12dc42a
Closes-bug: #1340459
Shift sysctl.d writing code to a new script

sysctl-set-value also sets the value on the build system, which
may cause unintended side effects while building images on
machines. Since most of these side effects are harmless, most
call sites can continue to use it, but also allow elements to
set a sysctl value that does not take immediate effect on the
host by just writing the file.

Change-Id: Ife8a156a22a305603c6b0af1c095e073e492a4b9
Use /simple instead of /openstack for pypi mirror

Were getting CI fails because /openstack is deprecated. Switching to
/simple which should fix this.

Change-Id: I5f6f1e0be7a66dbc31c5a2f09bd9cbb222ad9bc9
Merge "Rename os-config-applier to os-apply-config"
Remove references to os-config-applier

Change last references to os-config-applier (scripts, file names and
documentation) in os-apply-config element.

Change-Id: Ifa46522a48668adcef0d1fd5d28d2fc85141dce5
Merge "Make 74-cinder-tgt executable."
Merge "Shift sysctl.d writing code to a new script"