Added missing parameter into logger warning message
Added missing parameter into logger warning message

Missing parameter prevented using of customer defined
installer type when executing "functest env prepare" command.

JIRA: FUNCTEST-467

Change-Id: I69b69fa43584ec7ae4e4d8925f99624711131ef9
Signed-off-by: vitikkan <478f7ca616a7d23ed1ae94747b74c4df3ef9bdf3@nokia.com>

mywulin/functest,opnfv/functest,mywulin/functest,opnfv/functest