Filesystem: remove validate-all fstype check, as there isnt a reliable and portable way to check

This check cause Warnings and might cause errors in future pcs versions
when running "pcs resource create".

Example:
Warning: Validating resource options using the resource agent itself is enabled by default and produces warnings. In a future version, this might be changed to errors. Specify --agent-validation to switch to the future behavior.
Warning: Validation result from agent:

Jun 19 06:13:45 INFO: It seems we do not have ext3 support