At present, when heat-container-agent is executing SoftwareDeployment
scripts, the output of this is not visible to the cluster administrator
until the execution is complete. This is an unhelpful behaviour, as it
is far more useful to see what is happening in real time. This change
logs output to files under /var/log/heat-config/heat-config-script/.
Also removes duplication of prefix for heat-container-agent container.
Story: 2007264
Task: 38632
Change-Id: I5504c00efce89105d403722d583bb75f7bdea714
Signed-off-by: Bharat Kunwar <brtknr@bath.edu>