Update sysvinit function to support ubuntu

In ubuntu system, we can't find 'chkconfig' command, it use
"update-rc.d" or "sysv-rc-conf" for instead.

_handle_sysv_command function will pick up the right command to
enable service for ubuntu or fedora or redhat, and also map systemd
to _handle_sysv_command and remove _handle_systemd_command.

Change-Id: I5b7ceb7541e989f6b11fc1a5acf94275c1d2e75b
Closes-Bug: #1318481