Resource leak

[lcaouen]

If a PV is added without a prefix, then the release function in the PVPool doesn't find it and does not release it.

Java classes concerned
src/main/java/org/phoebus/pv/PVPool.java

Add (no prefix)
PVPool.createPV(name : my_pv, base_name : my_pv)

Remove (using prefix)
PVPool.releasePV(pv : loc://my_pv)

@shroffk :

@katysaintin has tried to correct this issue in this branch : master...katysaintin:phoebus:pv-local

There is a demo to reproduce it : https://drive.google.com/file/d/1Jwsb5x2lDna1FOe3_x1T80BC68Bxyqxa/view?usp=drive_link