Fix default make target
Fix default make target

The default make target should be `all` by convention but
since it is not the first target it wasn't getting triggered
as the default target. Fixed the makefile to make `all`
the first and default target.

Signed-off-by: Jana Radhakrishnan <045898bda7d4800fe4909a9831e702ab79e266be@docker.com>

vdemeester/docker,gnailuy/docker,konstruktoid/docker-upstream,paralin/docker,Mokolea/docker,docker/docker,jimjag/docker,trebonian/docker,jameszhan/docker,bearstech/moby,djs55/docker,bearstech/moby,nalind/docker,konstruktoid/docker-upstream,thaJeztah/docker,moby/moby,thaJeztah/docker,jimjag/docker,djs55/docker,flavio/docker,jimjag/docker,nawawi/docker,trebonian/docker,yosifkit/docker,moul/docker,Mokolea/docker,gnailuy/docker,bearstech/moby,yosifkit/docker,nawawi/docker,moby/moby,jameszhan/docker,gnailuy/docker,mahak/docker,flavio/docker,nalind/docker,flavio/docker,AkihiroSuda/docker,cpuguy83/docker,yosifkit/docker,flavio/docker,Ramzec/docker,AkihiroSuda/docker,cpuguy83/docker,trebonian/docker,paralin/docker,Ramzec/docker,mahak/docker,Mokolea/docker,nawawi/docker,moul/docker,AkihiroSuda/docker,cpuguy83/docker,paralin/docker,AkihiroSuda/docker,nawawi/docker,jthelin/docker,moby/moby,mahak/docker,moul/docker,konstruktoid/docker-upstream,trebonian/docker,djs55/docker,vdemeester/docker,nalind/docker,docker/docker,moul/docker,cpuguy83/docker,Mokolea/docker,bearstech/moby,jthelin/docker,jameszhan/docker,jimjag/docker,mahak/docker,nalind/docker,moby/moby,Ramzec/docker,konstruktoid/docker-upstream,thaJeztah/docker,gnailuy/docker,paralin/docker,Ramzec/docker,thaJeztah/docker,yosifkit/docker,docker/docker,vdemeester/docker