[Systemd][GenerateServiceFile] Add a new script to generate service file
for Systemd.
[Spec] Install systemd service file.
[Spec] Fix require package name.
[Systemd][GenerateServiceFile] Fix shebang path.
[Spec] Change a file name for httpd config file on CentOS6.
[Spec] Add httpd config file on CentOS7.
[Client][Makefile] Add and fix missing files name.
[Spec] Use %{_unitdir} macro instead of absolute path.
[Spec] Use install command instead of cp command.
[Spec] Install init file and systemd service file in %install section.
Merge pull request #782 from project-hatohol/support-centos7-20141125

Support systemd service file (v2)