Remove any existing tahoelafs install

src/freedombone-app-tahoelafs

 
     apt-get -yq install build-essential python-pip python-dev libffi-dev libssl-dev
     apt-get -yq install libcrypto++-dev python-pycryptopp python-cffi python-virtualenv
-    # create a user
-    if [ ! -d $TAHOE_DIR ]; then
-        # add a gogs user account
-        adduser --disabled-login --gecos 'tahoe-lafs' tahoelafs
-        adduser tahoelafs debian-tor
-        groupadd tahoelafs
+    if [ -d $TAHOE_DIR ]; then
+        deluser --remove-all-files tahoelafs
+        delgroup tahoelafs
+        rm -rf $TAHOE_DIR
     fi
 
+    # create a user
+    adduser --disabled-login --gecos 'tahoe-lafs' tahoelafs
+    adduser tahoelafs debian-tor
+    groupadd tahoelafs
+
     apt-get -yq install tahoe-lafs
     pip install tahoe-lafs[tor]