Issues826 - added ability to change block storage passwords

[allmightyspiff]

slcli block access-list 11657441
:..........:....................:.........:....................:.................................................:.......................:..............:.................:
:    id    :        name        :   type  : private_ip_address :                     host_iqn                    :        username       :   password   : allowed_host_id :
:..........:....................:.........:....................:.................................................:.......................:..............:.................:
: 31639541 : aaa.rhel.com : VIRTUAL :   10.173.177.122   : iqn.2005-05.com.softlayer:SL01SU1234-V31639541 : SL01SU1234-V31639541 : aaaAAA111### :      844473     :
:..........:....................:.........:....................:.................................................:.......................:..............:.................:
slcli block access-password  -p aaa2222###rrr 1233
Password updated for 844473
slcli block access-password  -p aaar 12373
FAILED updating password for 844473

[coveralls]

Coverage increased (+0.02%) to 84.261% when pulling e61c34b on allmightyspiff:issues826 into 172964c on softlayer:master.

[coveralls]

Coverage increased (+0.02%) to 84.261% when pulling d8f0b82 on allmightyspiff:issues826 into 172964c on softlayer:master.

[allmightyspiff]

this is to address #826

[houstar]

#841 will let you change the password once merged

#slcli block access-password -p new_pw allowed_host_id

I thank that we should use id to instead of allowed_host_id. Otherwise, This is may cause confusion