Update Meter/Histogram/Timer text format to be in line with Prometheus. Address 2) in #137
Update Meter/Histogram/Timer text format to be in line with Prometheus. Address 2) in #137

Signed-off-by: Raymond Lam <2e5d8a94c9ccc6688abf58c82d675708bfd6dfb3@ca.ibm.com>

pilhuhn/microprofile-metrics,Arjun-Sharma1/microprofile-metrics,pilhuhn/microprofile-metrics,Channyboy/microprofile-metrics,Arjun-Sharma1/microprofile-metrics,Channyboy/microprofile-metrics