[#131] Add management of ydb_gbldir env variable
We found out from initial testing that various utilities in the GUI
used ydb_gbldir
environment variable (e.g. GDE, MUPIP), and so the
server actually needs to set that one too.
Since this is a stateful operation, the tests were enhanced to show that if we fail after the switch the next call will still get the default values.
Version bumped to 4.1.1.
Edited by Sam Habiel