(CFACT-96) remove redundant mountpoints check in solaris filesystem resolver

Previously, the filesystem resolver checked for the existance of mountpoints
before returing the list of supported filesystems. However this is incorrect.
This patch removes the redundant mountpoints check.
Merge pull request #147 from vrthra/fix/cfact-96/solaris-filesystems

(CFACT-96) remove redundant mountpoints check in solaris filesystem resolver