int-cli/TestSearchCmdOptions: fail earlier
int-cli/TestSearchCmdOptions: fail earlier

Sometimes this test fails (allegedly due to problems with Docker Hub),
but it fails later than it should, for example:

> 01:20:34.845 assertion failed: expression is false: strings.Count(outSearchCmdStars, "[OK]") <= strings.Count(outSearchCmd, "[OK]"): The quantity of images with stars should be less than that of all images: <...>

This, with non-empty list of images following, means that the initial
`docker search busybox` command returned not enough results. So, add
a check that `docker search busybox` returns something.

While at it,
 * raise the number of stars to 10;
 * simplify check for number of lines (no need to count [OK]'s);
 * improve error message.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

SvenDowideit/docker,moby/moby,Ramzec/docker,yosifkit/docker,trebonian/docker,Mokolea/docker,konstruktoid/docker-upstream,jameszhan/docker,estesp/docker,mahak/docker,kojiromike/docker,konstruktoid/docker-1,kolyshkin/moby,estesp/docker,mahak/docker,ibuildthecloud/docker,flavio/docker,pradipd/moby,jvanz/docker,moul/docker,dims/docker,thaJeztah/docker,jvanz/docker,ibuildthecloud/docker,cpuguy83/docker,mikebrow/docker,docker/docker,tmp6154/docker,mahak/docker,AkihiroSuda/docker,thaJeztah/docker,cpuguy83/docker,moul/docker,mikebrow/docker,thaJeztah/docker,gnailuy/docker,moby/moby,justincormack/docker,rremer/moby,cpuguy83/docker,flavio/docker,ibuildthecloud/docker,jimjag/docker,AkihiroSuda/docker,kolyshkin/moby,thaJeztah/docker,tmp6154/docker,AkihiroSuda/docker,moby/moby,bearstech/moby,jvanz/docker,dims/docker,flavio/docker,Mokolea/docker,trebonian/docker,yongtang/docker,yosifkit/docker,rremer/moby,trebonian/docker,paralin/docker,unclejack/docker,SvenDowideit/docker,djs55/docker,jimjag/docker,paralin/docker,jameszhan/docker,jimjag/docker,Ramzec/docker,Mokolea/docker,crosbymichael/docker,nalind/docker,Ramzec/docker,yongtang/docker,ibuildthecloud/docker,nalind/docker,konstruktoid/docker-upstream,gnailuy/docker,Mokolea/docker,dims/docker,jimjag/docker,paralin/docker,nawawi/docker,Ramzec/docker,yongtang/docker,yosifkit/docker,bearstech/moby,crosbymichael/docker,jthelin/docker,bearstech/moby,gnailuy/docker,nalind/docker,moul/docker,moul/docker,konstruktoid/docker-1,bearstech/moby,gnailuy/docker,kolyshkin/moby,pradipd/moby,nawawi/docker,yosifkit/docker,vdemeester/docker,SvenDowideit/docker,unclejack/docker,justincormack/docker,tmp6154/docker,trebonian/docker,docker/docker,rremer/moby,ibuildthecloud/docker,estesp/docker,konstruktoid/docker-1,docker/docker,unclejack/docker,mahak/docker,moby/moby,justincormack/docker,vdemeester/docker,jameszhan/docker,pradipd/moby,vdemeester/docker,jthelin/docker,mikebrow/docker,djs55/docker,konstruktoid/docker-upstream,djs55/docker,nawawi/docker,AkihiroSuda/docker,flavio/docker,konstruktoid/docker-upstream,nalind/docker,paralin/docker,nawawi/docker,kojiromike/docker,kojiromike/docker,crosbymichael/docker,cpuguy83/docker