When a Data Query references a file, the filename should be trimmed to remove spurious spaces

[xmacan]

If xml path is correct but contains space at the end, it causes problems:

• creating graph - Error in Data Query. This could be due to the following: File Permissions, or a missing or improperly formatted Data Query XML file.
• Data Query Debug Information - Could not find data query XML file at '/usr/local/share/cacti/resource/snmp_queries/rvs_msg8_ilo4_darray_v1.xml '

I know, it is wrong user input but cacti could be little bit user friendly here.

1.2.23/1.3