fixed start.sh ps -f cannot find any process#1879

[feelwing1314]

What is the purpose of the change

fixed #1879

Brief changelog

change ps -f to ps -ef, Because ps -f channot find any process。

[codecov-io]

Codecov Report

Merging #1900 into master will decrease coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1900      +/-   ##
============================================
- Coverage     48.16%   48.08%   -0.09%     
+ Complexity     4347     4342       -5     
============================================
  Files           558      558              
  Lines         24364    24364              
  Branches       4323     4323              
============================================
- Hits          11736    11716      -20     
- Misses        10791    10806      +15     
- Partials       1837     1842       +5

Impacted Files	Coverage Δ	Complexity Δ
...onfig/spring/extension/SpringExtensionFactory.java	73.07% <0%> (-11.54%)	8% <0%> (ø)
...om/alibaba/dubbo/rpc/filter/ActiveLimitFilter.java	77.77% <0%> (-11.12%)	5% <0%> (-1%)
.../dubbo/remoting/transport/netty4/NettyChannel.java	56.25% <0%> (-8.75%)	20% <0%> (-2%)
...a/dubbo/remoting/transport/netty/NettyChannel.java	57.5% <0%> (-8.75%)	19% <0%> (-2%)
...a/dubbo/remoting/transport/netty4/NettyServer.java	72.13% <0%> (-3.28%)	9% <0%> (-1%)
...bo/remoting/transport/netty/NettyCodecAdapter.java	54.68% <0%> (+1.56%)	3% <0%> (ø)	⬇️
.../com/alibaba/dubbo/monitor/dubbo/DubboMonitor.java	89.71% <0%> (+1.86%)	15% <0%> (ø)	⬇️

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[diecui1202]

It looks good to me.