Change -l argument processing, to take up to three parts:

	-l<shmlog>,<space>,<fill>

<shmlog> is size of space for VSL records.
	default is 80m

<space> is size of space for other allocations (more later)
	default is 1m

<fill> is '+' or '-' to control preallocation of the shmfile,
	default to on (+), which reduces risk of fragmentation.



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4797 d4fa192b-c00b-0410-8231-f00ffab90ce4