Running 'fmf init' with '.fmf' file present leads to 'OSError: [Errno 17] File exists'

[jkrysl]

$ fmf init
Traceback (most recent call last):
File "/usr/bin/fmf", line 4, in
import('pkg_resources').run_script('fmf==0.5.1', 'fmf')
File "/usr/lib/python2.7/site-packages/pkg_resources/init.py", line 658, in run_script
self.require(requires)[0].run_script(script_name, ns)
File "/usr/lib/python2.7/site-packages/pkg_resources/init.py", line 1445, in run_script
exec(script_code, namespace, namespace)
File "/usr/lib/python2.7/site-packages/fmf-0.5.1-py2.7.egg/EGG-INFO/scripts/fmf", line 35, in

File "build/bdist.linux-x86_64/egg/fmf/cli.py", line 194, in main
File "build/bdist.linux-x86_64/egg/fmf/cli.py", line 73, in init
File "build/bdist.linux-x86_64/egg/fmf/cli.py", line 145, in command_init
File "/usr/lib64/python2.7/os.py", line 157, in makedirs
mkdir(name, mode)
OSError: [Errno 17] File exists: '/home/jkrysl/tests/python-stqe/tests/.fmf'

[psss]

For existing directory a reasonable error message is displayed:

> mkdir .fmf
> fmf init
[ ERROR ] Directory '/tmp/dir/.fmf' already exists.

This seems to be caused by a file of the same name. But we should handle this as well.