Allow multiple version of singleton feature with featureUtility installFeature command

[jjiwooLim]

Describe the bug
Both scenarios fail:

• /bin/featureUtility installFeature javaee-7.0 javaee-8.0 servlet-3.1
• /bin/featureUtility installFeature baseBundle

Initializing ...
<---------------------> 0.00%
Resolving remote features. This process might take several minutes to complete.
<====-----------------> 15.00%
CWWKF1405E: The javaee-7.0 and javaee-8.0 singleton features are incompatible with each other and they cannot be installed at the same time.

Steps to Reproduce

• /bin/featureUtility installFeature javaee-7.0 javaee-8.0 servlet-3.1

Expected behavior
When using a installFeature, featureUtility should allow installation of features with multiple versions.
This will also allow bundle feautres installation for closed liberty.

Diagnostic information:

• OpenLiberty Version: 21.x Liberty