Image with blank name being collected by move2kube collect

[Akash-Nayak]

Describe the bug
There is a image with blank name getting appended to the images list [quay.io/konveyor/move2kube-ui:latest nginx:stable-alpine ] because of \n character at the end of outputStr which causes warning message - Image [] not available in local image repo. Run "docker pull ".

$ move2kube collect -a dockerswarm --log-level debug

INFO[0000] Begin collection                             
INFO[0000] [*collector.ImagesCollector] Begin collection 
DEBU[0000] images : [quay.io/konveyor/move2kube-ui:latest nginx:stable-alpine ] 
DEBU[0000] UserID not available in image metadata for [quay.io/konveyor/move2kube-ui:latest] 
DEBU[0000] UserID not available in image metadata for [nginx:stable-alpine]       
WARN[0000] Image [] not available in local image repo. Run "docker pull " 
INFO[0000] [*collector.ImagesCollector] Done            
INFO[0000] Collection done                              
INFO[0000] Collect Output in [/Users/akash/github/move2kube-demos/m2k_collect]. Copy this directory into the source directory to be used for planning.

To Reproduce
Steps to reproduce the behavior:

1. Run move2kube collect -a dockerswarm --log-level debug command

Expected behavior
It should not add image with blank name in the images list.

Desktop (please complete the following information):

• OS: MacOS M1

[Akash-Nayak]

PR #1055 resolved this issue.