Support capacity charging test cases.
Enhance MGC bright_config tool to support configuration export.
Enhance bright_config tool
Add mgc cpu/mem info collection script.
Enhance:
1. support MGC health check; 
2. SIP/ISUP log name for easy distinction;
3. Start DNS for only DNS cases
4. Sleep 1 mins after Titansim mgw is stopped.
new mgc st stability cfg file
1， Add 'Time to Live' parameter for DNS cache.
2. Change DNS to use configure file.
3. Enhance Titansim ISUP supervisor.
1. Add workaround method for Titansim text mgw.(Start method is
different from binary MGW).
2. Add support to restore MGC backup.
3. Fix a little bug of ssh_cons_cb.
refactory the whole mgc pdb tool

please read the changelist file to see what changed
add Mp related functions in mim_xml
add some test cases for mim_xml
change rpc action API in netconf_rpc
because rpc action change, related netconf_mgc code changes
Separate DNS and Diameter simulators from src folder.
1. Add the function to modify call duration.
2. Fix the little bugs brought by DNS&Dia separation.
Move sessionDB to Diameter folder.
1. Remove ssh:connect from gen_server:init/1 in file
netconf_transport.erl and ssh_cons.erl
2. Add 'try..catch..' to catch exception due to netconf server is not
stable.
3. Change command 'du -sh' to get space used percent immediately
I don't know why it show the difference after I clone the MGC_ST repo

So I try to commit and sync it again
partly realize cba mgc bright config function.
Some basic API hase been realize.
Next step is to realize the test suite to config the mgc by the netconf.
1. Add a new suites for performance test.
2. Add new suites to support text MGW. 
3. Add a new suites for MGC installation.
4. Create/update corresponding .cfg files.
1. Change module netconf_mgc to netconf_mgc_util.
2. Change module netconf_is to netconf_rpc_is.
3. Other change to make mgc_pdb tool work for IS MGC.
1. cba_config: use local MGC_mp.xml as work around.
2. sftp_agent: change the way to start ssh application.
3. mim_xml: export some fuctions, fix a little bug of function
getCbaMoDataFromTree
4. sftp_user:update location of MGC_mp.xml on CBA
5. cba_config.hrl: new file, add action macro for CBA
6. cba_mgc_config_Suite: new file, config Suite for CBA
1. Restructure code
2. Merge code of mgc_pdb and main branch together
3. Support configuration for CBA
4. Add a small ST case for CBA