redis-cli --pipe: send final ECHO in a safer way.
redis-cli --pipe: send final ECHO in a safer way.

If the protocol read from stdin happened to contain grabage (invalid
random chars), in the previous implementation it was possible to end
with something like:

dksfjdksjflskfjl*2\r\n$4\r\nECHO....

That is invalid as the *2 should start into a new line. Now we prefix
the ECHO with a CRLF that has no effects on the server but prevents this
issues most of the times.

Of course if the offending wrong sequence is something like:

$3248772349\r\n

No one is going to save us as Redis will wait for data in the context of
a big argument, so this fix does not cover all the cases.

This partially fixes issue #681.

jacklee0810/redis,jqk6/redis,ideaar/redis,nandhanurrevanth/redis,upsoft/redis,quangnguyen90/redis,adamweixuan/redis,kts12345/redis,hanmichael/redis,nandhanurrevanth/redis,kolonse/redis,Jonavin/redis,janeasystems/redis,sidsen/redis,alpha8/redis,adamweixuan/redis,liqiang199105/redis,hanmichael/redis,miminus/redis,powerumc/MyRedis,erwin00776/redis-2.8-optimize,kts12345/redis,oaastest/redis,laurencee/redis,enginekit/redis,nandhanurrevanth/redis,LittlePeng/redis,richmonkey/netleveldb,sidsen/redis,jacklee0810/redis,jaambee/redis,enginekit/redis,kolonse/redis,Jonavin/redis,enginekit/redis,shanegxxiao/redis,fanxu/redis,ideaar/redis,alpha8/redis,crask/redis-cutter,StartTheShift/redis-shift,kts12345/redis,alpha8/redis,richmonkey/netleveldb,Cybermaxs/redis,damy/redis,adamweixuan/redis,miminus/redis,powerumc/MyRedis_old,enginekit/redis,erwin00776/redis-2.8-optimize,oaastest/redis,damy/redis,oaastest/redis,upsoft/redis,shanegxxiao/redis,jacklee0810/redis,sidsen/redis,damy/redis,upsoft/redis,powerumc/MyRedis,nandhanurrevanth/redis,sidsen/redis,jqk6/redis,LittlePeng/redis,jacklee0810/redis,damy/redis,jqk6/redis,ScottKaiGu/redis,kolonse/redis,ScottKaiGu/redis,Jonavin/redis,liqiang199105/redis,nandhanurrevanth/redis,Cybermaxs/redis,jaambee/redis,erwin00776/redis-2.8-optimize,ideaar/redis,jqk6/redis,adamweixuan/redis,janeasystems/redis,kolonse/redis,crask/redis-cutter,quangnguyen90/redis,LittlePeng/redis,janeasystems/redis,quangnguyen90/redis,oaastest/redis,alpha8/redis,Jonavin/redis,liqiang199105/redis,ideaar/redis,powerumc/MyRedis,ScottKaiGu/redis,Cybermaxs/redis,sidsen/redis,powerumc/MyRedis_old,upsoft/redis,kts12345/redis,laurencee/redis,liqiang199105/redis,upsoft/redis,janeasystems/redis,StartTheShift/redis-shift,miminus/redis,miminus/redis,fanxu/redis,miminus/redis,hanmichael/redis,laurencee/redis,sidsen/redis,kts12345/redis,ScottKaiGu/redis,jaambee/redis,hanmichael/redis,StartTheShift/redis-shift,quangnguyen90/redis,richmonkey/netleveldb,shanegxxiao/redis,ScottKaiGu/redis,laurencee/redis,alpha8/redis,Cybermaxs/redis,quangnguyen90/redis,fanxu/redis,powerumc/MyRedis_old,adamweixuan/redis,crask/redis-cutter,ideaar/redis,janeasystems/redis,laurencee/redis,kolonse/redis,jaambee/redis,powerumc/MyRedis_old,oaastest/redis,Cybermaxs/redis,hanmichael/redis,shanegxxiao/redis,shanegxxiao/redis,damy/redis,jaambee/redis,liqiang199105/redis,Jonavin/redis,enginekit/redis,erwin00776/redis-2.8-optimize,richmonkey/netleveldb,jqk6/redis,jacklee0810/redis,fanxu/redis