LU-17000 utils: Call yaml_parser_scan before using 'token'

LU-17000 utils: Call yaml_parser_scan before using 'token'

Function 'yaml_parser_scan' is used to initilize and get
the next token. Call yaml_parser_scan() before using token.

Test-Parameters: trivial testlist=sanity-lnet
CoverityID: 403112 ("Uninitialized scalar variable")
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Ieeb3d50a32690dc892a831fb60a9e85e4ec05113
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55330
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>