RFR: 8272914: Create hotspot:tier2 and hotspot:tier3 test groups [v3]

[Aleksey Shipilev]

> Currently, no tests run in `hotspot:tier2` and `hotspot:tier3` groups, yet some groups have the "tier2" and "tier3" in their names. As we move tests from `hotspot:tier1`, they need to land in higher tiers. Therefore, we need `hotspot:tier2` and `hotspot:tier3`.
> 
> I had to exclude `InvocationTests` from `tier3`, because they run for a very long time.
> 
> Sample runs:
> 
> 
> TEST                                              TOTAL  PASS  FAIL ERROR   
> jtreg:test/hotspot/jtreg:tier2                      383   383     0     0   
> 
> real	10m9.008s
> user	418m16.348s
> sys	37m16.874s
> 
> 
> 
> TEST                                              TOTAL  PASS  FAIL ERROR   
> jtreg:test/hotspot/jtreg:tier3                       72    72     0     0   
> 
> real	6m51.729s
> user	368m37.880s
> sys	4m26.574s
> 
> 
> These also hook up properly to global `tier2` and `tier3`.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `hotspot:tier2`
>  - [x] Linux x86_64 fastdebug `hotspot:tier3`

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Cleaner test group definitions

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5241/files
  - new: https://git.openjdk.java.net/jdk/pull/5241/files/51ee12e7..832dcc3a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5241&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5241&range=01-02

  Stats: 5 lines in 1 file changed: 1 ins; 4 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5241.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5241/head:pull/5241

PR: https://git.openjdk.java.net/jdk/pull/5241