Add missing restart command

Author: krassowski

atest/03_Notebook.robot

@@ -91,6 +91,7 @@ Adding Text To Cells After Kernel Restart
     Setup Notebook    Python    ${file}
     ${virtual_path} =    Set Variable    ${VIRTUALDOCS DIR}${/}${file}
     Wait Until Created    ${virtual_path}
+    Restart Kernel
     Enter Cell Editor    1
     Lab Command    Insert Cell Below
     Enter Cell Editor    2    line=1

atest/05_Features/Completion.robot

@@ -302,11 +302,6 @@ Completer Should Include Documentation
     Wait Until Keyword Succeeds    10 x    1 s    Element Should Contain    ${DOCUMENTATION_PANEL}    ${text}
     Element Should Contain    ${DOCUMENTATION_PANEL}    ${text}
 
-Restart Kernel
-    Lab Command    Restart Kernel…
-    Wait For Dialog
-    Accept Default Dialog Option
-
 Count Completer Hints
     ${count} =    Get Element Count    css:.jp-Completer-item
     [Return]    ${count}

atest/Keywords.robot

@@ -419,3 +419,8 @@ Open New Notebook
     Wait For Dialog
     # Kernel selection dialog shows up, accept Python as default kernel
     Accept Default Dialog Option
+
+Restart Kernel
+    Lab Command    Restart Kernel…
+    Wait For Dialog
+    Accept Default Dialog Option