Description of problem:
I created configuration channels and upload some plain text and some binary files (zips) to them. When I have to compare all local files then I received strings of binary file. I think that it is not good solution. We can look at behaviour bash application 'diff' and we can see:

>> diff /root/binary.dat /dev/null 
Binary files /root/binary.dat and /dev/null differ

Version-Release number of selected component (if applicable):
rhncfg-5.10.74-10.el6sat.noarch

How reproducible:
always

Steps to Reproduce:
1. create configure channel with binary file
2. subscribe this channel
3. rhncfg-client diff /file.binary
   rhncfg-namager diff /file.binary -c channel

Actual results:
diff two binary files:
+k]r >W_?S-LB9l쳼Ef[lQUlˋe ?LV׊+2az7PՓnYq2Gbq&<5˂r`laT䣛S/5U^>'
                                                               4[sUO.&t[gn/Sێ;n4M=8Wg5|Jΐ(c=IHI-~=0|l(D)$>jm5}'-VY+?M
$zİ23Zo8[}3\0d>wN(nGT1oNj\4!t)u
-kl#GFe9-^Ǟ@S ?0bkVp2fBSUZ}Qo-&ƂC`JI7-jIFU*3o}R-Xy-sy2_P-XukƁx_bM O5XZV&(plR4+"y=-t3    `fq


Expected results:
something as:
Binary files /root/binary.dat and /dev/null differ