Added tag jtreg-8+2 for changeset 81c6097

Added tag jtreg-7.5.2+1 for changeset 05c67a7

Added tag jtreg-7.5.1+1 for changeset 8e4d9b4

Added tag jtreg-7.5+1 for changeset 899baad

Added tag jtreg-7.4+1 for changeset c40e6ea

7903518: Release jtreg 7.3.1

Reviewed-by: jjg

Added tag jtreg-7.3+1 for changeset 0694696

7903373: Add ability to customize test execution using main wrapper p…

…lugin

Reviewed-by: jjg

7903418: It is not possible to build jtreg 6.1 branch using jdk 11.0.18

Reviewed-by: clanger, jjg

7903394: Update version to 7.1.1

7903386: Update changelog for jtreg 7.1
7903390: Summary reporter getter not thread-safe

Reviewed-by: jjg