[YANG] [sub]module name uniqueness

Hi,

Sec 4.2.1 is silent on the requirement for module and sub-module
names to be unique, across some naming scope.  This is needed
for interoperability.

There are 3 options for processing import or include statements:

  1) modules and sub-module names are globally unique, and there can
     only 1 file that corresponds to a given import or include statement.

  2) there is some proprietary mechanism to determine which file
     is requested when more than 1 corresponds to the import or include
     statement value.

  3) there is some standard mechanism to determine which file
     is requested when more than 1 corresponds to the import or include
     statement value.

IMO, modules and submodules need to share the
same naming scope, and be globally unique.
All SMIv2 module names should also be considered part
of this naming scope, so that SMIv2 modules translated to YANG do
not conflict with new modules written in YANG.

Andy

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