Clarify help text of tcl scripts. (#7798)
Clarify help text of tcl scripts. (#7798)

Before this commit, following command did not show --tls option:
./runtest-cluster --help
./runtest-sentinel --help
ofirluzon/redis,neomantra/redis,charsyam/redis,antirez/redis,PKRoma/redis,charsyam/redis,yossigo/redis,ofirluzon/redis,neomantra/redis,yossigo/redis,PKRoma/redis,charsyam/redis,neomantra/redis,ofirluzon/redis,oranagra/redis,soloestoy/redis,ctripcorp/redis,charsyam/redis,neomantra/redis,yossigo/redis,charsyam/redis,ctripcorp/redis,oranagra/redis,ctripcorp/redis,soloestoy/redis,yossigo/redis,ctripcorp/redis,ofirluzon/redis,PKRoma/redis,oranagra/redis,soloestoy/redis,oranagra/redis,antirez/redis,PKRoma/redis,ofirluzon/redis,soloestoy/redis,yossigo/redis,soloestoy/redis,PKRoma/redis,antirez/redis,oranagra/redis,neomantra/redis,antirez/redis