specs: Fall back to /var/lock if subsys doesn't exist

Signed-off-by: Euan Harris <euan.harris@citrix.com>
specs: Use LSB init-functions instead of RedHat-specific functions

Signed-off-by: Euan Harris <euan.harris@citrix.com>
xen-api-xapissl: Use LSB init-functions

Signed-off-by: Euan Harris <euan.harris@citrix.com>