CLOUDSTACK-9695: VM snapshot is disabled if the VM Instance is off

[rashmidixit]

Refer to CLOUDSTACK-9695 for more details.

[rashmidixit]

As part of this fix, added a new property called "isDisabled" for a field in a dialog. If this function returns true, then the field will be disabled.

[rohityadavcloud]

@rashmidixit change the PR's base branch to 4.9 please.

[rashmidixit]

@rhtyd This is a minor improvement and hence in master. I have updated the corresponding bugs' fix version.

[koushik-das]

@rashmidixit Code LGTM. Please provide screenshots of the changes.

[ustcweizhou]

why not change vmActionfilter in ui/scripts/instances.js ?
it will be much simple.

[rashmidixit]

@ustcweizhou The reason for not putting this in vmActionFilter is that the snapshot action itself is allowed when a VM is shut down. We only want to disable the option for memory snapshot which is not valid in this case. Hope this clarifies.

[rashmidixit]

ping @koushik-das.

When VM is running and snapshot option is clicked, the memory option is enabled.

When VM is stopped and snapshot option is clicked, the memory option is disabled.

[ghost]

Tested the functionality, working as desired.

[ghost]

[ghost]

Test results are as desired. LGTM

[ramkatru]

tag:mergeready

[resmo]

LGTM (based on code review)