libcontainer/capabilities_linux: Drop os.Getpid() call #1724
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gocapability has supported 0 as “the current PID” since syndtr/gocapability#2. libcontainer was ported to that approach in 444cc29 (docker-archive/libcontainer#358), but the change was clobbered by 22df555 which landed via 5b73860 (docker-archive/libcontainer#388). This pull-request restores the changes from 444cc29.