Fixing centos-7 ulimits

[nwang92]

This seems to only be affecting Centos 7 images. But I'm seeing:

$ docker run -d -e SPLUNK_START_ARGS=--accept-license -e SPLUNK_PASSWORD=helloworld splunk-centos-7:latest no-provision
6487e7c91d1b6584c4a01ddc9ec06caf17c29ca5082dc352bc7db860523ad6ec

$ docker exec -it 6487e7c91d1b6584c4a01ddc9ec06caf17c29ca5082dc352bc7db860523ad6ec bash
[ansible@6487e7c91d1b splunk]$ whoami
ansible
[ansible@6487e7c91d1b splunk]$ ulimit -u
unlimited

$ docker exec -it --user splunk 6487e7c91d1b6584c4a01ddc9ec06caf17c29ca5082dc352bc7db860523ad6ec bash
[splunk@6487e7c91d1b splunk]$ whoami
splunk
[splunk@6487e7c91d1b splunk]$ ulimit -u
unlimited

$ docker exec -it  6487e7c91d1b6584c4a01ddc9ec06caf17c29ca5082dc352bc7db860523ad6ec bash
[ansible@6487e7c91d1b splunk]$ ulimit -u
unlimited
[ansible@6487e7c91d1b splunk]$ sudo -u splunk bash
[splunk@6487e7c91d1b splunk]$ ulimit -u
4096