Drop the legacy Grid Replicated Storage (grsfs-fuse) distributed file system (#509)

* Drop the legacy Grid Replicated Storage (grsfs-fuse) distributed file system
backend wholesale since we don't use or maintain it any longer.

* Remove leftover references to grsfs-fuse in github workflows as suggested in
review feedback (thanks @rasmunk).

Author: jonasbardino

.github/workflows/python-sanity-check.yml

@@ -101,18 +101,17 @@ jobs:
       - name: Lint with flake8
         run: |
           # TODO: fix unittest dir and remove from excludes
-          # TODO: fix or migrate legacy grsfs-fuse dir and remove from excludes
           # NOTE: include tests here as they should be fully python3 compatible
           # stop the build if there are Python syntax errors or undefined names
-          flake8 . --exclude=state,envhelp,fixture,output,unittest,grsfs-fuse,irclib.py,seafile-seahub_settings-template.py --count --select=E9,F63,F7,F82 --ignore=F824 --show-source --statistics
+          flake8 . --exclude=state,envhelp,fixture,output,unittest,irclib.py,seafile-seahub_settings-template.py --count --select=E9,F63,F7,F82 --ignore=F824 --show-source --statistics
           # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-          flake8 . --exclude=state,envhelp,fixture,output,unittest,grsfs-fuse,vm-proxy,irclib.py,seafile-seahub_settings-template.py --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+          flake8 . --exclude=state,envhelp,fixture,output,unittest,vm-proxy,irclib.py,seafile-seahub_settings-template.py --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
           # NOTE: for interactive clean up one can use current ignores
           # E501 Ignore long lines, E402 imports below top, E722 bare except,
           # F401 unused imports, F502 explicit list in str expand, F841 unused var,
           # E721 compare type instead of isinstance, W293 blank line with space,
           # C901 too complex get
-          #flake8 mig --exclude=unittest,grsfs-fuse,vm-proxy,irclib.py,seafile-seahub_settings-template.py --ignore=E501,E402,E722,F401,F502,E713,F841,C901 --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+          #flake8 mig --exclude=unittest,vm-proxy,irclib.py,seafile-seahub_settings-template.py --ignore=E501,E402,E722,F401,F502,E713,F841,C901 --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
       # TODO: prepare and enable pytest
       #- name: Test with pytest
       #  run: |
@@ -158,19 +157,18 @@ jobs:
       - name: Lint with flake8
         run: |
           # TODO: fix unittest dir and remove from excludes
-          # TODO: fix or migrate legacy grsfs-fuse dir and remove from excludes
           # NOTE: include tests here as they should be fully python3 compatible
           # TODO: fix e.g. '`global logger` is unused' and remove F824 from ignores
           # stop the build if there are Python syntax errors or undefined names
-          flake8 . --exclude=state,envhelp,fixture,output,unittest,grsfs-fuse,irclib.py,seafile-seahub_settings-template.py --count --select=E9,F63,F7,F82 --ignore=F824 --show-source --statistics
+          flake8 . --exclude=state,envhelp,fixture,output,unittest,irclib.py,seafile-seahub_settings-template.py --count --select=E9,F63,F7,F82 --ignore=F824 --show-source --statistics
           # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-          flake8 . --exclude=state,envhelp,fixture,output,unittest,grsfs-fuse,vm-proxy,irclib.py,seafile-seahub_settings-template.py --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+          flake8 . --exclude=state,envhelp,fixture,output,unittest,vm-proxy,irclib.py,seafile-seahub_settings-template.py --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
           # NOTE: for interactive clean up one can use current ignores
           # E501 Ignore long lines, E402 imports below top, E722 bare except,
           # F401 unused imports, F502 explicit list in str expand, F841 unused var,
           # E721 compare type instead of isinstance, W293 blank line with space,
           # C901 too complex get
-          #flake8 mig --exclude=unittest,grsfs-fuse,vm-proxy,irclib.py,seafile-seahub_settings-template.py --ignore=E501,E402,E722,F401,F502,E713,F841,C901 --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+          #flake8 mig --exclude=unittest,vm-proxy,irclib.py,seafile-seahub_settings-template.py --ignore=E501,E402,E722,F401,F502,E713,F841,C901 --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
       # TODO: prepare and enable pytest
       #- name: Test with pytest
       #  run: |