Optimizing looping over namespaces

[harche]

There is no need to loop twice just to skip the namespaces
that we don't need to join.

Signed-off-by: Harshal Patil harshal.patil@in.ibm.com

[cyphar]

Please run gofmt on your code and amend your commit accordingly, thanks.

[harche]

Updated my branch after running go fmt. Thanks.

[cyphar]

From the CI:

$ make BUILDTAGS="${BUILDTAGS}" clean validate test
rm -f runc
rm -f contrib/cmd/recvtty/recvtty
rm -rf /home/travis/gopath/src/github.com/opencontainers/runc/release
rm -rf /home/travis/gopath/src/github.com/opencontainers/runc/man/man8
script/validate-gofmt
These files are not properly gofmt'd:
 - libcontainer/container_linux.go
Please reformat the above files using "gofmt -s -w" and commit the result.
make: *** [validate] Error 1

You need to use gofmt -s -w.

[harche]

Updated my branch after running gofmt -s -w . Thanks.

[cyphar]

LGTM, thanks.

[mrunalp]

LGTM