Use of LD_LIBRARY_PATH in etc/init.d/xrootd

Path to Qserv plugin is no more hard-coded in
xrootd configuration file, but infered using
LD_LIBRARY_PATH.
Use of QSERV_LUA_SHARE in etc/init.d/mysql-proxy

QSERV_LUA_SHARE relies on LUA_DIR and points to
lua libraries path. It has been moved from mysql-proxy
configuration file to an environment variable in service
startup script.
Remove Qserv install directory from qserv-client.conf
Compute lua library paths in etc/init.d/mysql-proxy

Computation of lua shared and libraries directories, using lua install
directory (i.e. LUA_DIR), moved from configuration procedure to
mysql-proxy init.d script. This will allows mysql-proxy to use eups
LUA_DIR environment variable, without having to re-configure Qserv.
Enable use of eups environment in etc/init.d/qserv-czar

- move init.d script configuration parameters issued from meta-config
  to etc/sysconfig/qserv-czar
- if EUPS_DIR environment variable exists, then etc/init.d/qserv-function
  loads eups environment, instead of the one issued from meta-config file.
Add of meta-config file location in template parameters

Header comments of template-generated files can display
used meta-configuration file.
Enable use of eups environment in etc/init.d/mysql-proxy
Enable use of eups environment in etc/init.d/xrootd
Separate paths management for Qserv services

- init.d/path.cfg.sh loads paths in environment using eups or
  meta-config file,
- source_sysconfig() loads parameters for Qserv services
  from etc/sysconfig/service-name.
Enable use of eups environment in etc/init.d/mysqld
Enable use of eups environment in etc/init.d/zookeeper
Improve one configuration error message
Group paths and parameters management for services

init.d/path.cfg.sh is now sourced in source_sysconfig(),
in order to slim init.d script and ease maintenance.
Check dependency paths prior to services launch
Removal of use of eups environment in init.d scripts

Switching Qserv or dependencies versions in init.d script
using eups product information is risky and may lead to
inconsistency between Qserv configuration and binaries.
Merge all sysconfig files in etc/sysconfig/qserv

Having one sysconfig file for managing pathes to
Qserv and dependencies installation directories, and
one sysconfig file for each services was too complex.
Remove global variable $DIR in source_sysconfig()
Add check for each variable of etc/sysconfig/qserv

init.d scripts performs simple checks on Qserv services
configuration parameters. These checks, which strenghten
Qserv startup scripts, can be easily avoided with a minor
update to etc/sysconfig/qserv-functions.
Remove network check in mysql-proxy init script
Fix typos and minor bugs for init script