Fix an issue with finding vmrun and vboxmanage

Ref #1575

gns3server/modules/virtualbox/__init__.py

@@ -68,7 +68,7 @@ class VirtualBox(BaseManager):
             else:
                 vboxmanage_path = "vboxmanage"
 
-        if not os.path.abspath(vboxmanage_path):
+        if not os.path.isabs(vboxmanage_path):
             vboxmanage_path = shutil.which(vboxmanage_path)
 
         if not vboxmanage_path:

gns3server/modules/vmware/__init__.py

@@ -107,7 +107,7 @@ class VMware(BaseManager):
             else:
                 vmrun_path = "vmrun"
 
-        if not os.path.abspath(vmrun_path):
+        if not os.path.isabs(vmrun_path):
             vmrun_path = shutil.which(vmrun_path)
 
         if not vmrun_path: