Description of problem:
The installer-gather.sh fails to collect some logs for the permission problem.

Version-Release number of the following components:
# ./openshift-install version
./openshift-install v4.1.0-201905032232-dirty
built from commit e05263cfc7bdf305612f5b78fe91a16cbfea4ce6
release image registry.svc.ci.openshift.org/ocp/release@sha256:6a5dd3e5df1e11a464fa5f0e9ccdcff2d60baa96e11b196948094761d702bb97

How reproducible:

Steps to Reproduce:
1. openshift-install create cluster --dir test
2. enter 'ctrl-c' to break openshift-install to simulate the failure scenario
3. use the sub-command 'gather' to collect information, as follows:
    # ./openshift-install gather bootstrap --dir test
INFO Use the following commands to gather logs from the cluster 
INFO ssh -A core.33.44 '/usr/local/bin/installer-gather.sh 10.0.141.243 10.0.157.184 10.0.167.252' 
INFO scp core.33.44:~/log-bundle.tar.gz . 
    # ssh -A core.33.44 '/usr/local/bin/installer-gather.sh 10.0.141.243 10.0.157.184 10.0.167.252'
  
Actual results:
# ssh -A core.33.44 '/usr/local/bin/installer-gather.sh 10.0.141.243 10.0.157.184 10.0.167.252'
    cp: cannot open '/var/opt/openshift/auth/kubeconfig' for reading: Permission denied
    ... ...
    find: ‘/tmp/artifacts/rendered-assets/openshift/mco-bootstrap/bootstrap’: Permission denied
    ... ...
    find: ‘/tmp/artifacts/rendered-assets/openshift/mco-bootstrap/bootstrap’: Permission denied

Expected results:
Skip the files from which we can't read 
or escalate the authority to collect information

Additional info:
Please attach logs from ansible-playbook with the -vvv flag