Use an API key with NetBackup REST APIs

After a key is created, the user can pass the API key in the API request headers. For example:

curl -X GET https://primaryservername.domain.com/netbackup/admin/jobs/5 \
     -H 'Accept: application/vnd.netbackup+json;version=3.0'     \
     -H 'Authorization: <API key value>'