Ticket3396 show global macros

[Chsudeepta]

Description of work

This is the blockserver change to add the globals.txt settings to the config.

To test

This address the issue described here

Acceptance criteria

The globals.txt settings should get added to the current config and passed on to the GUI.

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Code Review

• Is the code of an acceptable quality?
• Has the author taken into account the multi-threaded nature of the code?
• Have the changes been recorded appropriately in a PR for release notes?

Functional Tests

• Do changes function as described? Add comments below that describe the tests performed.

Final steps

• Reviewer has updated the submodule in the main EPICS repo? See Reviewing work for the subModules of EPICS in the Git workflow page for details.
• Reviewer has merged the associated PR for the release notes