Patch for pgAdmin4 RPM package

pgadmin4-rpm.patch - This is the main patch that includes scripts, makefiles and spec to create RPMs for RHEL6/RHEL7/F-22/F-23/F-24. 

It will create two RPMs i.e pgadmin4 and pgadmin4-web. The  pgadmin4 tpm depends on web and the web rpm depends on the python packages. I have commented the list of packages which are not available on some systems so that Devrim can build them.

The installation path for pgadmin4 is "/usr/pgadmin4-<major>.<minor>" and pgadmin4-web is the site-packages/pgadmin4-web

pgadmin4-server-ini.patch - This is the patch for runtime/Server.cpp. As said pgadmin4-web and runtime installation directories are different and that means web does not exists in parallel to runtime like in sources. 

I observed that the location of application settings was not defined in Server.cpp. As per QSettings doc, the default location on Unix is the $HOME/.config/<companyname>/<appname>.conf. Here, $HOME depends on the user that runs the application. So, I thought why not to define the application settings in application directory itself. RPM then knows where to define the ApplicationPath. I tested it and it worked fine with me. I haven't done this change for platform dependent. 

Another change that I did in this file is that, I observed that canonicalPath() was not giving the absolute path (by removing the sym link and the redundant ".." as per doc). Hence, I used absolutePath() for the paths[i] that are relative (../web, etc) and not for the already absolute path (ex. ApplicationPath like /usr/lib/python2.7/site-packages/pgadmin4-web). 

Well, I'm not a developer and the patch is just an attempt to resolve the issue related to packaging. Please feel free to change it as required for better.  

Thanks.

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