FTP-Server: Add handling for checking folder name in setpath

This patch adds proper handling to check for name of folder to be set
or created using set folder operation. Name is now checked for exisitng
file name at same location, and error is returned to Client if exsiting
file with same name already exists.

Change-Id: I2a43e6b30767c922f53743e9019715518dfab312
CRs-Fixed: 605667
1 file changed