Bug fixes

• bigip_ltm_policy: can't create new plan when initial creation failed #1007
• bigip_ltm_pool_attachment import block does not populate most properties #1031
• Issue #1014 - vCMP guest virtual-disk removal works when there's more than 1 entry #1015
• Add Bash example for bigip_command #1017
• Fix handling of single quotes in shell commands #1019