LU-13628 tests: replace btime with crtime for statx test

LU-13628 tests: replace btime with crtime for statx test

Tests sanityn/106a failed due to wrongly using 'btime' to filter
the debugfs output for file creation time, which should be
'crtime'.

This patch also replaces '-c %q' with '-c %p' in sanityn/106c to
get the statx 'stx_attributes_mask': Mask to show what's supported
in 'stx_attributes'.

Test-Parameters: trivial clientdistro=el8
Test-Parameters: trivial clientdistro=ubuntu1804
Signed-off-by: Qian Yingjin <qian@ddn.com>
Change-Id: Ia8273e02d4ebe7f1e9e5d6973e691c82e0524fb2
Reviewed-on: https://review.whamcloud.com/38880
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Wei Liu <sarah@whamcloud.com>