Scenario Import fix + UT fixes

Demo scenario version upgrade to v1.5.3

Disconnected Physical Locations + Configurable POA Selection Priority

gis engine support for automated disconnection mobility events + wireless type priority specific poa selection

connected, wireless & wirelessType parameters in model + DISCONNECTED mobility event support + TC Engine fixes + UT updates

user-chart folder creation and demo2 documentation update

Changes:
- Added code to add user-charts folder in ~/.meep/virt-engine as part of deploy process
- Create new file to build demo2 which will copy demo2 to ~/.meep/virt-engine/

Tests:
- All UT's and cypress tests passed
- Manual testing of demo2 worked correctly

Fixed Net Char Event displays values without selecting an element

Added reset element function in store instead of updating the element on network-charac container close

Changes:
- onUpdateElement was getting called separately for type and name, so the change in type was not happening because of timing delay.
So added separate code for updating it only once.
- Removed 8081 port for MEEP_HOST in package.json since it is not required now

Test:
- All UT's and Cypress test passed
- Manually checked, the old behaviour is not observed

Session Keepalive

Supporting K8s 1.19 in current setup

Changes:
- Changed 'OPERATOR GENERIC' to 'OPERATOR' and 'POA GENERIC' to 'POA' in cypress-exec-spec test
- Changed for loop from 'Array of Objects' to 'Object Array' of Element Types
- Changes for MEEP_BTN_CANCEL and MEEP_BTN_APPLY in data-cy for having only one in DOM

Tests:
- All UT's and Cypress passed
- Checked manual deployment of sandbox and scenario

Removed the conditional checks in helper file and added hardcoded values in deployment and statefulset