Fix flake8 issues found in cli

cli/onionshare_cli/onionshare.py

@@ -18,7 +18,8 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
 
-import os, shutil
+import os
+import shutil
 from .common import AutoStopTimer
 
 
@@ -57,7 +58,7 @@ class OnionShare(object):
         """
         try:
             self.port = self.common.get_available_port(17600, 17650)
-        except:
+        except Exception:
             raise OSError("Cannot find an available OnionShare port")
 
     def start_onion_service(self, mode, mode_settings, await_publication=True):
@@ -102,7 +103,7 @@ class OnionShare(object):
                     os.remove(filename)
                 elif os.path.isdir(filename):
                     shutil.rmtree(filename)
-        except:
+        except Exception:
             # Don't crash if file is still in use
             pass
         self.cleanup_filenames = []