Move Hardcoded Directory Permissions and Index filename to Config

[streamingsystems]

Hi,

I was hoping you could merge these very important (but small) changes for us into the main code base so we don't have to keep our own fork and build our own code -- we can use the public repositories that automatically build.

In your code you have this:

#define NGX_RTMP_HLS_DIR_ACCESS 0744

We need to be able to set this to 755 for our environment.

So we added this option to the configuration:

hls_dir_access 0755;

Also, we needed the ability to change the name of the "index" file name which is also hardcoded.

So we added this option to the configuration:

hls_nested_index_filename chunklist;

Other servers like SRS have the above feature in their config.

We hired a developer to make these changes to the code so it should be well done.

Kindly merge these changes into the code base.

Thanks!

-Rob