RFR (XXS): 8189729: Change reclaimable_bytes_perc() to reclaimable_bytes_percent() in G1CollectorPolicy

[Thomas Schatzl]

Hi all,

  can I have a review for this trivial renaming of some method to end
with _percent() instead of _perc() as we do elsewhere?

CR:
https://bugs.openjdk.java.net/browse/JDK-8189729
Webrev:
http://cr.openjdk.java.net/~tschatzl/8189729/webrev/
Testing:
local compilation

Thanks,
  Thomas