RPM specfile cleanup

[davidcoutadeur]

This issue is just for documenting the job already done by @xavierba in MR #246

The goal is to clean the specfile with:

• typos
• good practices
• obsolete techniques

[davidcoutadeur]

For the record, the cleaning that have been done in the issue is also pushed at debian packaging here: #264

[davidcoutadeur]

I list here the evolutions that change the previous behaviour:

• name more precisely the licence: BSD -> BSD-3-Clause
• version is temporarily named 2.2. When the package would be released, we have to define the correct final version (2.2.0?)
• new variable in specfile: %%global snapshot 1 now permits to build snapshot release for tests
• when building manually, we must now use the target package *-dist.tar.gz and no more the .zip
• Nagios script is now bundle as a different package: nagios-plugins-lsc
• Nagios scripts are now deployed in the more standard destination: /usr/lib/nagios/plugins/
• Nagios package is requiring nagios-common, which is available in EPEL repository
• LSC package is now requiring crontabs
• home directory of lsc user is no more /etc/lsc, but /var/lib/lsc, and this directory is owned by lsc user
• lsc user don't have a default shell any more, but /sbin/nologin
• don't delete lsc user to prevent possible uid re-use
• don't deploy any more /usr/share/doc/lsc/lib64 and /usr/share/doc/lsc/bin/lsc symlinks (previously used to run the samples from the lsc doc directory). The new lsc package is also removing these symlinks.
• now deploying an html documentation generated from the README.md (outdated though)
• now deploying some manpages (outdated though)
• don't systematically change /var/log/lsc owner in %post to lsc. lsc is still declared the owner of /var/log/lsc, but as a directory attribute (%attr)
• hsqldb script is now using /var/lib/lsc as its working directory, and no more /var/lsc
• hsqldb script is now using /run/hsqldb.pid and no more /var/hsqldb.pid
• useless windows .bat files are now removed from the package
• specfile is renamed from lsc-core.spec to lsc.spec